Shown with a cast-on count of 38 stitches.  

• Row 1 (RS): K7, *k2tog, yo, k9, repeat from * to last 9 sts, k2tog, yo, k7.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: K2, purl to last 2 sts, k2.
• Rows 3 and 15: K6, *[k2tog, yo] twice, k7, repeat from * to last 10 sts, [k2tog, yo] twice, k6.
• Rows 5 and 13: K5, *[k2tog, yo] 3 times, k5, repeat from * to last 11 sts, [k2tog, yo] 3 times, k5.
• Rows 7 and 11: K4, *[k2tog, yo] 4 times, k3, repeat from * to last 12 sts, [k2tog, yo] 4 times, k4.
• Row 9: K3, *[k2tog, yo] 5 times, k1, repeat from * to last 13 sts, [k2tog, yo] 5 times, k3.