Shown with a cast-on count of 12 stitches.  

• Round 1: K12.
• Round 2: *Yo, k1, repeat from * (24 sts).
• Rounds 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, and 35: Knit.
• Round 4: [K2, (k1, yo, k1) in next st, k1] 6 times (36 sts).
• Round 6: [K3, (k1, yo, k1) in next st, k2] 6 times (48 sts).
• Round 8: [K4, (k1, yo, k1) in next st, k3] 6 times (60 sts).
• Round 10: [K5, (k1, yo, k1) in next st, k4] 6 times (72 sts).
• Round 12: [K6, (k1, yo, k1) in next st, k5] 6 times (84 sts).
• Round 14: [K7, (k1, yo, k1) in next st, k6] 6 times (96 sts).
• Round 16: [K8, (k1, yo, k1) in next st, k7] 6 times (108 sts).
• Round 18: [K9, (k1, yo, k1) in next st, k8] 6 times (120 sts).
• Round 20: [K1, yo, ssk, k15, k2tog, yo] 6 times.
• Round 22: [K2, yo, ssk, k13, k2tog, yo, k1] 6 times.
• Round 24: [K3, yo, ssk, k11, k2tog, yo, k2] 6 times.
• Round 26: [K4, yo, ssk, k9, k2tog, yo, k3] 6 times.
• Round 28: [K5, yo, ssk, k7, k2tog, yo, k4] 6 times.
• Round 30: [K6, yo, ssk, k5, k2tog, yo, k5] 6 times.
• Round 32: [K7, yo, ssk, k3, k2tog, yo, k6] 6 times.
• Round 34: [K8, yo, ssk, k1, k2tog, yo, k7] 6 times.
• Round 36: [K9, yo, sl1-k2tog-psso, yo, k8] 6 times.