Shown with a cast-on count of 28 stitches.  

• Row 1 (RS): K2, *k9, k2tog, yo, k1, repeat from * to last 2 sts, k2.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, and 18: K2, *p12, repeat from * to last 2 sts, k2.
• Row 3: K2, *k8, k2tog, k1, yo, k1, repeat from * to last 2 sts, k2.
• Row 5: K2, *k7, k2tog, k2, yo, k1, repeat from * to last 2 sts, k2.
• Row 7: K2, *k6, k2tog, k3, yo, k1, repeat from * to last 2 sts, k2.
• Row 9: K2, *k5, k2tog, k4, yo, k1, repeat from * to last 2 sts, k2.
• Row 11: K2, *k4, k2tog, k5, yo, k1, repeat from * to last 2 sts, k2.
• Row 13: K2, *k3, k2tog, k6, yo, k1, repeat from * to last 2 sts, k2.
• Row 15: K2, *k2, k2tog, k7, yo, k1, repeat from * to last 2 sts, k2.
• Row 17: K2, *k1, k2tog, k8, yo, k1, repeat from * to last 2 sts, k2.