Use a size H crochet hook or the size to obtain the size you wish.

ROW 1:  Chain 32, dc in 4th ch from hook, *ch 1, skip next ch, dc in next ch, repeat from across  (16 dc).

ROW 2:  Chain 4, turn, dc in 1st ch sp, (ch 1, dc in next ch sp) across.  End with dc in the 3rd ch of last dc.

ROW 3:  Chain 3, turn, dc in the 1st ch sp, (dc in next dc, dc in next ch sp) across.  End with dc in 3rd ch of beginning ch-4.
ROW 4:  Ch 4, turn, dc in 2nd dc, (ch 1, skip next dc, dc in next ch) across.  End with ch 1, dc in 3rd ch of last dc.
ROW 5 – 17: Repeat Rows 3 & 4, alternately, ending with a Row 3.
ROW 18:  Ch 3, dc in the 1st ch sp, (ch 1, dc in next ch sp) across, ending with dc in 3rd ch of the last dc.
ROW 19: Ch 2, make 2 hdc in same st, hdc evenly around having 3 hdc in each corner.  Join with sl st to top of the beg. Ch-2.  End off and weave in ends.

Orginal