Shown with a cast-on count of 29 stitches.  

• Row 1 (RS): K2, [yo, k1] 26 times, k1 (55 sts).
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: K2, purl to last 2 sts, k2.
• Row 3: K2, yo, k1, [k2tog, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, k2tog] 3 times, k1, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1, [ssk, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, ssk] 3 times, k1, yo, k2 (63 sts).
• Row 5: K2, yo, k1, [k2tog, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, k2tog] 3 times, k3, yo, k1, yo, k3, yo, k1, yo, k3, yo, k1, yo, k3, [ssk, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, ssk] 3 times, k1, yo, k2 (71 sts).
• Row 7: K2, yo, k1, [k2tog, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, k2tog] 3 times, k5, yo, k1, yo, k2, yo, ssk, k1, yo, k1, yo, k1, k2tog, yo, k2, yo, k1, yo, k5, [ssk, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, ssk] 3 times, k1, yo, k2 (79 sts).
• Row 9: K2, yo, k1, [k2tog, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, k2tog] 3 times, k4, yo, ssk, k1, yo, k1, yo, k2, [yo, ssk] twice, k1, yo, k1, yo, k1, [k2tog, yo] twice, k2, yo, k1, yo, k1, k2tog, yo, k4, [ssk, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, ssk] 3 times, k1, yo, k2 (87 sts).
• Row 11: K2, yo, k1, [k2tog, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, k2tog] 3 times, k4, [yo, ssk] twice, k1, yo, k1, yo, k2, [yo, ssk] 3 times, k1, yo, k1, yo, k1, [k2tog, yo] 3 times, k2, yo, k1, yo, k1, [k2tog, yo] twice, k4, [ssk, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, ssk] 3 times, k1, yo, k2 (95 sts).
• Row 13: K2, yo, k1, [k2tog, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, k2tog] 3 times, k4, [yo, ssk] 3 times, k1, yo, k1, yo, k4, [yo, ssk] 3 times, k1, yo, k1, yo, k1, [k2tog, yo] 3 times, k4, yo, k1, yo, k1, [k2tog, yo] 3 times, k4, [ssk, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, ssk] 3 times, k1, yo, k2 (103 sts).
• Row 15: K2, yo, k1, [k2tog, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, k2tog] 3 times, k6, [yo, ssk] 3 times, k1, yo, k1, yo, k6, [yo, ssk] 3 times, k1, yo, k1, yo, k1, [k2tog, yo] 3 times, k6, yo, k1, yo, k1, [k2tog, yo] 3 times, k6, [ssk, yo] 3 times, k3, yo, sl1-k2tog-psso, yo, k3, [yo, ssk] 3 times, k1, yo, k2 (111 sts).