Instructions:

Ch 4, join with sl st to form ring.

Rnd 1: Ch 3 (counts as first dc, here and throughout), work 11 dc in ring; join with sl st to 3rd ch of beg ch 3. (12 dc)

Rnd 2: Ch 3, fpdc around ch 3 of rd 1, (dc in next dc, fpdc around same dc) around, join with sl st to 3 rd ch of beg ch 3. (24 sts)

Rnd 3: Ch 3, dc in top of  next fpdc, fpdc around same fpdc, (dc in next dc. dc in top of next fpdc, fpdc around same fpdc) 11 times, join with sl st to 3rd ch of beg ch 3. (36 sts)

Rnd 4: Ch 3, dc in next dc, dc in top of next fpdc, fpdc around same fpdc, (dc in next 2 dc, dc in top on next fpdc, fpdc around same fpdc) 11 times, join with sl st to 3rd ch of beg ch 3.(48 sts)

Rnd 5: Ch 3, dc in next 2 dc, dc in top of next fpdc, fpdc around same fpdc, (dc in next 3 dc, dc in top of next fpdc, fpdc around same fpdc) 11 times, join with sl st in 3rd ch of beg ch 3. (60 sts)

Rnd 6: Ch 3, dc in next 3 dc, dc in top of next fpdc, fpdc around same fpdc, (dc in next 4 dc, dc in top of next fpdc, fpdc around same fpdc) 11 times, join with sl st in 3rd ch of beg ch 3. (72 sts)

Rnd 7: Ch 3, dc in next 4 dc, dc in top of next fpdc, fpdc around same fpdc, (dc in next 5 dc, dc in top of next fpdc, fpdc around same fpdc) 11 times, join with sl st in 3rd ch of beg ch 3. (84 sts)

Rnd 8: Ch 3, dc in next 5 dc, dc in top of next fpdc, fpdc around same fpdc, (dc in next 6 dc, dc in top of next fpdc, fpdc around same fpdc) 11 times, join with sl st in 3rd ch of beg ch 3. (96 sts)

Rnd 9: Sl st in next 3 dc, ch 4 to count as 1st tr, 8 tr in same st, sk 3 dc, sc in top of next fpdc, *skip next 3 dc, 9 tr in next dc, skip 3 dc , sc in top of next fpdc*. Repeat from * to * 10 times,  join with sl st in 4th ch of beg ch 4. (12 shells, 120 sts)

Rnd 10: Ch 4 (counts as 1st tr), working in back loops only, dc in next st, hdc in next st, sc in each of next 3 sts, hdc in next st, dc in next st, tr in next st (tr in each of next 2 sts, dc in next st, hdc in next st, sc in each of next 3 sts, hdc in next st, dc in next st, tr in next st) 11 times, join with sl st to 4th ch of beg ch 4. (120 sts)

Rnd 11: Ch 1, in both loops, sc in same st, sc in each of next 3 sts,  hdc in each of next 4 sts,  dc in each of next 4 sts,  tr in each of next 3 sts, 3 dtr in next st, tr in each of next 3 sts, dc in each of next 4 sts, hdc in each of next 4 sts (sc in each of next 7 sts, hdc in each of next 4 sts, dc in each of next 4 st, tr in each of next 3 sts, 3 dtr in next st, tr in each of next 3 sts, dc in each of next 4 sts, hdc in each of next 4 sts) 3 times, sc in each of next 3 sts, join with sl st in beg sc. (128 sts)

Rnd 12: Ch 1, sc in same st, sc in each of next 3 sts,  hdc in each of next 4 sts,  dc in each of next 4 sts,  tr in each of next 4 sts, 5 dtr in next st, tr in each of next 4 sts, dc in each of next 4 sts, hdc in each of next 4 sts (sc in each of next 7 sts, hdc in each of next 4 sts, dc in each of next 4 st, tr in each of next 4 sts, 5 dtr in next st, tr in each of next 4 sts, dc in each of next 4 sts, hdc in each of next 4 sts) 3 times, sc in each of next 3 sts, join with sl st in beg sc. (144 sts)

Rnd 13: Ch 1, sc in same st, sc around, 3 sc in each corner, join with sl st to beg sc. (152  sts)