Shown with a cast-on count of 37 stitches.  

• Row 1 (RS): K37.
• Row 2: P20, turn (20 sts).
• Row 3: Sl1 wyib, k1, k2tog, turn (3 sts).
• Row 4: Sl1 wyif, yo, p1, yo, p2tog, turn (5 sts).
• Rows 5 and 7: Sl1 wyib, k3, k2tog, turn.
• Row 6: Sl1 wyif, p3, p2tog, turn.
• Row 8: Sl1 wyif, yo, p3, yo, p2tog, turn (7 sts).
• Rows 9 and 11: Sl1 wyib, k5, k2tog, turn.
• Row 10: Sl1 wyif, p5, k2tog, turn.
• Row 12: Sl1 wyif, yo, p5, yo, p2tog, turn (9 sts).
• Rows 13 and 15: Sl1 wyib, k7, k2tog, turn.
• Row 14: Sl1 wyif, p7, k2tog, turn.
• Row 16: Sl1 wyif, yo, p7, yo, p2tog, turn (11 sts).
• Rows 17 and 19: Sl1 wyib, k9, k2tog, turn.
• Row 18: Sl1 wyif, p9, k2tog, turn.
• Row 20: Sl1 wyif, yo, p9, yo, p2tog, turn (13 sts).
• Rows 21 and 23: Sl1 wyib, k11, k2tog, turn.
• Row 22: Sl1 wyif, p11, k2tog, turn.
• Row 24: Sl1 wyif, yo, p11, yo, p2tog, turn (15 sts).
• Rows 25 and 27: Sl1 wyib, k13, k2tog, turn.
• Row 26: Sl1 wyif, p13, k2tog, turn.
• Row 28: Sl1 wyif, yo, p13, yo, p2tog, turn (17 sts).
• Rows 29 and 31: Sl1 wyib, k15, k2tog, turn.
• Row 30: Sl1 wyif, p15, k2tog, turn.
• Row 32: Sl1 wyif, yo, p15, yo, p2tog, turn (19 sts).
• Rows 33 and 35: Sl1 wyib, k17, k2tog, turn.
• Row 34: Sl1 wyif, p17, k2tog, turn.
• Row 36: Sl1 wyif, yo, p17, yo, p2tog, turn (21 sts).