Shown with a cast-on count of 3 stitches.  

• Row 1 (RS): K1, yo, k1, yo, knit (5 sts).
• Rows 2, 4, 6, 8, 10, 12, and 14: Purl.
• Row 3: K1, yo, k3, yo, knit (7 sts).
• Row 5: K1, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1 (13 sts).
• Rows 7 and 11: Knit.
• Row 9: K1, yo, k3, yo, k1, yo, k3, yo, k1, yo, k3, yo, k1 (19 sts).
• Row 13: K1, yo, k5, yo, k1, yo, k5, yo, k1, yo, k5, yo, k1 (25 sts).
• Row 15: K1, yo, k2tog, k19, ssk, yo, k1.
• Row 16: P2, yo, p2tog, p17, ssp, yo, p2.
• Row 17: K1, yo, k2, yo, k2tog, p15, ssk, yo, k2, yo, k1 (27 sts).
• Row 18: P5, yo, p2tog, p13, ssp, yo, p5.
• Row 19: K10, yo, k2tog, k3, ssk, yo, k10.
• Row 20: P11, yo, p2tog, p1, ssp, yo, p11.
• Row 21: K12, yo, sl1-k2tog-psso, yo, k12.
• Row 22: P9, yo, p2tog, p5, ssp, yo, p9.