Shown with a cast-on count of 3 stitches.  

• Row 1 (WS): P3.
• Row 2: K1, yo, k1, yo, k1 (5 sts).
• Row 3: P2tog, purl to last 2 sts, p2tog (3 sts).
• Row 4: K1, yo, (k1, yo, k1) in next st, yo, k1 (7 sts).
• Row 5: P2tog, k3, p2tog (5 sts).
• Row 6: K1, yo, k1, (k1, yo, k1) in next st, k1, yo, k1 (9 sts).
• Row 7: P2tog, purl to last 2 sts, p2tog (7 sts).
• Rows 8 and 10: K1, yo, k2, (k1, yo, k1) in next st, k2, yo, k1 (11 sts).
• Row 9: P2tog, k1, k2tog, k1, k2tog, k1, p2tog (7 sts).
• Row 11: P2tog, purl to last 2 sts, p2tog (9 sts).
• Rows 12 and 14: K1, yo, k3, (k1, yo, k1) in next st, k3, yo, k1 (13 sts).
• Row 13: P2tog, k2, k2tog, k1, k2tog, k2, p2tog (9 sts).
• Row 15: P2tog, purl to last 2 sts, p2tog (11 sts).
• Row 16: K1, yo, k4, (k1, yo, k1) in next st, k4, yo, k1 (15 sts).
• Row 17: P2tog, k3, k2tog, k1, k2tog, k3, p2tog (11 sts).