Shown with a cast-on count of 20 stitches.  

• Row 1 (RS): K1, k2tog, yo, k11, [yo, k2tog] twice, yo, k2 (21 sts).
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, and 36: Knit.
• Row 3: K1, k2tog, yo, k12, [yo, k2tog] twice, yo, k2 (22 sts).
• Row 5: K1, k2tog, yo, k8, k2tog, yo, k3, yo, k2tog, yo, k2tog, yo, k2 (23 sts).
• Row 7: K1, k2tog, yo, k7, k2tog, yo, k1, yo, k2tog, k2, yo, k2tog, yo, k2tog, yo, k2 (24 sts).
• Row 9: K1, k2tog, yo, k6, k2tog, yo, k3, yo, k2tog, k2, yo, k2tog, yo, k2tog, yo, k2 (25 sts).
• Row 11: K1, k2tog, yo, k5, k2tog, yo, k5, yo, k2tog, k2, yo, k2tog, yo, k2tog, yo, k2 (26 sts).
• Row 13: K1, k2tog, yo, k4, k2tog, yo, k2, k2tog, yo, k3, yo, k2tog, k2, yo, k2tog, yo, k2tog, yo, k2 (27 sts).
• Row 15: K1, k2tog, yo, k3, k2tog, yo, k2, k2tog, yo, k1, yo, k2tog, k2, yo, k2tog, k2, yo, k2tog, yo, k2tog, yo, k2 (28 sts).
• Row 17: K1, k2tog, yo, k2, k2tog, yo, k2, k2tog, yo, k3, yo, k2tog, k2, yo, k2tog, k2, yo, k2tog, yo, k2tog, yo, k2 (29 sts).
• Row 19: K1, k2tog, yo, k4, yo, k2tog, k2, yo, k3tog, yo, k2, k2tog, yo, k2, [k2tog, yo] 3 times, k2tog, k1 (28 sts).
• Row 21: K1, k2tog, yo, k5, yo, k2tog, k2, yo, k2tog, k1, k2tog, yo, k2, [k2tog, yo] 3 times, k2tog, k1 (27 sts).
• Row 23: K1, k2tog, yo, k6, yo, k2tog, k3, k2tog, yo, k2, [k2tog, yo] 3 times, k2tog, k1 (26 sts).
• Row 25: K1, k2tog, yo, k7, yo, k2tog, k1, k2tog, yo, k2, [k2tog, yo] 3 times, k2tog, k1 (25 sts).
• Row 27: K1, k2tog, yo, k8, yo, k3tog, yo, k2, [k2tog, yo] 3 times, k2tog, k1 (24 sts).
• Row 29: K1, k2tog, yo, k9, yo, k2tog, k1, [k2tog, yo] 3 times, k2tog, k1 (23 sts).
• Row 31: K1, k2tog, yo, k11, [k2tog, yo] 3 times, k2tog, k1 (22 sts).
• Row 33: K1, k2tog, yo, k10, [k2tog, yo] 3 times, k2tog, k1 (21 sts).
• Row 35: K1, k2tog, yo, k9, [k2tog, yo] 3 times, k2tog, k1 (20 sts).
• Repeat rows 1-36.