Shown with a cast-on count of 18 stitches.  

• Row 1 (RS): K9, yo, k3tog, p1, yo, k1, yo, k2tog, yo, k2 (19 sts).
• Rows 2 and 14: Yo, k2tog, k17.
• Row 3: K8, yo, k3tog, p1, yo, k3, yo, k2tog, yo, k2 (20 sts).
• Rows 4 and 12: Yo, k2tog, k18.
• Row 5: K7, yo, k3tog, p1, yo, k5, yo, k2tog, yo, k2 (21 sts).
• Rows 6 and 10: Yo, k2tog, k19.
• Row 7: K6, yo, k3tog, p1, yo, k7, yo, k2tog, yo, k2 (22 sts).
• Row 8: Yo, k2tog, k20.
• Row 9: K13, yo, k3tog, p1, yo, k2tog, yo, k2tog, k1 (21 sts).
• Row 11: K12, yo, k3tog, p1, yo, k2tog, yo, k2tog, k1 (20 sts).
• Row 13: K11, yo, k3tog, p1, yo, k2tog, yo, k2tog, k1 (19 sts).
• Row 15: K10, yo, k3tog, p1, yo, k2tog, yo, k2tog, k1 (18 sts).
• Row 16: Yo, k2tog, k16.