Shown with a cast-on count of 1 stitch.  

• Round 1: Yo, k1 (2 sts).
• Rounds 2, 4, 6, 8, 10, 12, 14, 16, 18-21, 23-25, 27, 29, 31, 33, 35, 37, and 39: Knit.
• Round 3: Yo, k2 (3 sts).
• Round 5: Yo, k3 (4 sts).
• Round 7: Yo, k4 (5 sts).
• Round 9: Yo, k5 (6 sts).
• Round 11: Yo, k1, yo, k5 (8 sts).
• Round 13: Yo, k3, yo, k3, k2tog (9 sts).
• Round 15: Yo, k2tog, k1, k2tog, yo, k2, k2tog (8 sts).
• Round 17: [Yo, k1, yo, k3tog tbl] twice.
• Round 22: *Yo, k2tog, repeat from *.
• Round 26: *Yo, k1, yo, k2tog, k1, repeat from * (10 sts).
• Round 28: *K1, yo, k1, yo, k2tog, k1, repeat from * (12 sts).
• Round 30: *K2, yo, k1, yo, k2tog, k1, repeat from * (14 sts).
• Round 32: *K3, yo, k1, yo, k2tog, k1, repeat from * (16 sts).
• Round 34: *K4, yo, k1, yo, k2tog, k1, repeat from * (18 sts).
• Round 36: *K5, yo, k1, yo, k2tog, k1, repeat from * (20 sts).
• Round 38: *K6, yo, k1, yo, k2tog, k1, repeat from * (22 sts).