Shown with a cast-on count of 39 stitches.  

• Row 1 (WS): K39.
• Row 2: Ssk, k16, sl1-k2tog-psso, k16, k2tog (35 sts).
• Row 3: P35.
• Row 4: Ssk, k1, [yo, ssk] 6 times, k1, sl1-k2tog-psso, k1, [k2tog, yo] 6 times, k1, k2tog (31 sts).
• Row 5: P31.
• Row 6: Ssk, k12, sl1-k2tog-psso, k12, k2tog (27 sts).
• Row 7: K27.
• Row 8: Ssk, k10, sl1-k2tog-psso, k10, k2tog (23 sts).
• Row 9: P23.
• Row 10: Ssk, k1, [yo, ssk] 3 times, k1, sl1-k2tog-psso, k1, [k2tog, yo] 3 times, k1, k2tog (19 sts).
• Row 11: P19.
• Row 12: Ssk, k6, sl1-k2tog-psso, k6, k2tog (15 sts).
• Row 13: K15.
• Row 14: Ssk, k4, sl1-k2tog-psso, k4, k2tog (11 sts).
• Row 15: P11.
• Row 16: Ssk, k2, sl1-k2tog-psso, k2, k2tog (7 sts).
• Row 17: K7.
• Row 18: Ssk, sl1-k2tog-psso, k2tog (3 sts).
• Row 19: Sssp (1 st).