Shown with a cast-on count of 13 stitches.  

• Rows 1 and 15 (RS): K3, yo, k2tog, k8.
• Row 2: Yo, k3, yo, k2tog, k4, yo, k2tog, k2 (14 sts).
• Rows 3 and 13: K3, yo, k2tog, k9.
• Row 4: Yo, k5, yo, k2tog, k3, yo, k2tog, k2 (15 sts).
• Row 5: K3, yo, k2tog, k10.
• Row 6: Yo, k1, k2tog, yo, k1, yo, k2tog, k1, yo, k2tog, k2, yo, k2tog, k2 (16 sts).
• Rows 7 and 11: K3, yo, k2tog, k11.
• Row 8: Yo, k1, k2tog, yo, k3, yo, k2tog, k1, yo, k2tog, k1, yo, k2tog, k2 (17 sts).
• Row 9: K3, yo, k2tog, k12.
• Row 10: Yo, k3tog, k1, yo, k3tog, yo, k1, k2tog, yo, k3, yo, k2tog, k2 (16 sts).
• Row 12: Yo, k3tog, k1, k2tog, k2tog, yo, k4, yo, k2tog, k2 (14 sts).
• Row 14: Yo, k3tog, k2tog, yo, k5, yo, k2tog, k2 (13 sts).
• Row 16: Yo, k3tog, yo, k6, yo, k2tog, k2.