Shown with a cast-on count of 19 stitches.  

• Round 1: *Yo, k1, repeat from * (38 sts).
• Rounds 2, 12, 14, 16, and 20: Knit.
• Round 3: M1L, k1, M1L, M1L, k1, M1L, k1, M1L, k16, M1L, k2, M1L, k14, M1L, k2, k1 tbl (46 sts).
• Round 4: K2, M1L, knit to last 2 sts, M1L, k2 (48 sts).
• Round 5: K11, M1L, k1, M1L, k7, M1L, k2tog, M1L, k2, ssk, k20, M1L, k2, k1 tbl (51 sts).
• Round 6: K1, [M1L, k3] 16 times, M1L, k2 (68 sts).
• Round 7: *K1, M1L, k4, ssk, k2, k2tog, M1L, k2, M1L, k2, ssk, k2tog, k2, M1L, k2, M1L, k2, ssk, k2tog, k5, M1L, repeat from *.
• Round 8: K5, k2tog, k10, [k2tog, k9] 3 times, k2tog, k10, k2tog, k4 (62 sts).
• Round 9: M1L, k3, ssk, k2tog, k5, M1L, k1, M1L, k6, ssk, k2tog, k5, M1L, k1, M1L, k5, ssk, yo, k2, ssk, k2, ssk, k2, k4, yo, k2tog, yo, k2tog, k3, ssk, yo, k2, k1 tbl (61 sts).
• Round 10: K3, [k2tog, k6] twice, [k2tog, k5] twice, [k2tog, k6] 3 times, k2tog, k2 (53 sts).
• Round 11: K1, ssk, yo, [k1, M1L] 4 times, [kfb, k2] 15 times, k1 tbl (72 sts).
• Round 13: M1L, k14, [k2tog, yo] 11 times, M1L, k2, ssk, yo, ssk, M1L, k1, M1L, k3, k2, [yo, k2tog] twice, k2, [yo, k2tog] twice, k3, yo, [k2tog] twice, k2, [yo, k2tog] twice, k1 (74 sts).
• Round 15: K4, ssk, [yo, k2tog] twice, k1, [ssk, yo, k1] 3 times, k4, yo, k2, ssk, k4, [yo, k2tog] twice, k2, [k2tog, k2, yo, k2tog] twice, yo, k11, k2tog, [yo, k2tog] 3 times, k3, k2tog (70 sts).
• Round 17: [Yo, k3, yo, k2tog, k1, ssk, yo, k1, yo, k2tog, k1, ssk, yo, k1, yo, k2tog, k1, ssk, yo, k1, k2tog, yo, k1, yo, ssk, yo, k1, yo, k2tog] twice, k1, yo, k2tog, k1, yo, k2tog, k1, yo, k2tog, k1, k2tog (73 sts).
• Round 18: K1, M1L, k1, M1L, knit to last st, M1L, k1 (76 sts).
• Round 19: [[Yo, ssk] twice, yo, sl1-k2tog-psso, yo, k1, yo, ssk, yo, k1, yo, k2tog, yo, k2tog, yo, k2tog, yo, k2tog] 4 times (80 sts).