Shown with a cast-on count of 13 stitches.  

• Row 0 (RS): K13.
• Rows 1 and 21 (RS): P1, k2, p1, [yo, k2tog] 3 times, k2, p1.
• Row 2: K1, M1R, k11, M1L, k1 (15 sts).
• Rows 3 and 19: P1, k2, p1, [yo, k2tog] 4 times, k2, p1.
• Row 4: K1, M1R, k13, M1L, k1 (17 sts).
• Rows 5 and 17: P1, k2, p1, [yo, k2tog] 5 times, k2, p1.
• Row 6: K1, M1R, k15, M1L, k1 (19 sts).
• Rows 7 and 15: P1, k2, p1, [yo, k2tog] 6 times, k2, p1.
• Row 8: K1, M1R, k17, M1L, k1 (21 sts).
• Rows 9 and 13: P1, k2, p1, [yo, k2tog] 7 times, k2, p1.
• Rows 10 and 12: K21.
• Row 11: P1, k2, p2, [yo, k2tog] 6 times, p1, k2, p1.
• Row 14: K1, k2tog, k15, ssk, k1 (19 sts).
• Row 16: K1, k2tog, k13, ssk, k1 (17 sts).
• Row 18: K1, k2tog, k11, ssk, k1 (15 sts).
• Row 20: K1, k2tog, k9, ssk, k1 (13 sts).
• Row 22: K13.
• Row 23: P1, k2tog, k7, ssk, k1 (11 sts).
• Rows 24, 26, and 28: P3, k5, p3.
• Rows 25, 27, and 29: K11.