Shown with a cast-on count of 1 stitch.  

• Rounds 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, and 21: Knit.
• Round 2: *K1, yo, repeat from * (2 sts).
• Round 4: *K1, yo, repeat from * (4 sts).
• Round 6: K1, yo, k3, yo (6 sts).
• Round 8: Yo, k1, yo, k5 (8 sts).
• Round 10: K1, yo, k6, yo, k1 (10 sts).
• Round 12: K2, k2tog, yo, k1, yo, k1, yo, k1, yo, ssk, k1 (12 sts).
• Round 14: K1, k2tog, yo, k3, yo, ssk, yo, k3, yo, k1 (14 sts).
• Round 16: M1L, k6, yo, k3tog, yo, k5, M1L (16 sts).
• Round 18: M1L, k16, M1L (18 sts).