Shown with a cast-on count of 2 stitches.  

• Row 1 (RS): *K1, p1, repeat from *.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, and 36: *K1, p1, repeat from *.
• Row 3: (K1, yo, k1) in next st, p1 (4 sts).
• Row 5: (K1, yo, k1) in next st, p1, k1, p1 (6 sts).
• Row 7: (K1, yo, k1) in next st, p1, [k1, p1] twice (8 sts).
• Row 9: (K1, yo, k1) in next st, p1, [k1, p1] 3 times (10 sts).
• Row 11: (K1, yo, k1) in next st, p1, [k1, p1] 4 times (12 sts).
• Row 13: (K1, yo, k1) in next st, p1, [k1, p1] 5 times (14 sts).
• Row 15: (K1, yo, k1) in next st, p1, k1, p1, sl1-k2tog-psso, p1, (k1, yo, k1) in next st, p1, [k1, p1] twice (16 sts).
• Row 17: (K1, yo, k1) in next st, p1, k1, p1, sl1-k2tog-psso, p1, k1, p1, (k1, yo, k1) in next st, p1, [k1, p1] twice (18 sts).
• Row 19: (K1, yo, k1) in next st, p1, k1, p1, sl1-k2tog-psso, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (20 sts).
• Row 21: (K1, yo, k1) in next st, p1, k1, p1, sl1-k2tog-psso, p1, (k1, yo, k1) in next st, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (24 sts).
• Row 23: (K1, yo, k1) in next st, p1, k1, p1, sl1-k2tog-psso, p1, (k1, yo, k1) in next st, p1, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (26 sts).
• Row 25: (K1, yo, k1) in next st, p1, k1, p1, sl1-k2tog-psso, p1, k1, p1, (k1, yo, k1) in next st, p1, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (28 sts).
• Row 27: (K1, yo, k1) in next st, p1, k1, p1, sl1-k2tog-psso, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (30 sts).
• Row 29: (K1, yo, k1) in next st, p1, [k1, p1] twice, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (32 sts).
• Row 31: (K1, yo, k1) in next st, p1, [k1, p1] 3 times, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (34 sts).
• Row 33: (K1, yo, k1) in next st, p1, [k1, p1] 4 times, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (36 sts).
• Row 35: (K1, yo, k1) in next st, p1, [k1, p1] 5 times, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, k3tog, p1, [k1, p1] twice, (k1, yo, k1) in next st, p1, [k1, p1] twice (38 sts).