Shown with a cast-on count of 2 stitches.  

• Rounds 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, and 39: Knit.
• Round 2: *Yo, k1, repeat from * (multiple of 2 sts).
• Round 4: *K1, yo, repeat from * (multiple of 2 sts).
• Round 6: *K2, yo, repeat from * (multiple of 3 sts).
• Round 8: *K3, yo, repeat from * (multiple of 4 sts).
• Round 10: *K4, yo, repeat from * (multiple of 5 sts).
• Round 12: *K5, yo, repeat from * (multiple of 6 sts).
• Round 14: *Ssk, k7, k2tog, yo, k1 tbl, yo, repeat from *.
• Round 16: *Ssk, k5, k2tog, yo, k3, yo, repeat from *.
• Round 18: *Ssk, k3, k2tog, yo, k2, yo, k2tog, k1, yo, repeat from *.
• Round 20: *Ssk, k1, k2tog, yo, k2, yo, k2tog, yo, k2tog, k1, yo, repeat from *.
• Round 22: *K4, yo, ssk, k1, yo, k2tog, k2tog, yo, k1, repeat from *.
• Round 24: *K5, yo, ssk, k1 tbl, k2tog, yo, k2, repeat from *.
• Round 26: *K1, yo, k1, yo, k4, yo, sl1-k2tog-psso, yo, k3, repeat from * (multiple of 14 sts).
• Round 28: *Yo, k1 tbl, [yo, ssk] twice, k7, k2tog, repeat from *.
• Round 30: *Yo, k1 tbl, [yo, ssk] 3 times, k5, k2tog, repeat from *.
• Round 32: *Yo, k1 tbl, [yo, ssk] 4 times, k3, k2tog, repeat from *.
• Round 34: *Yo, k1 tbl, [yo, ssk] 5 times, k1, k2tog, repeat from *.
• Round 36: *Yo, k1 tbl, [yo, ssk] 5 times, yo, sl1-k2tog-psso, repeat from *.
• Round 38: *Yo, k1 tbl, [yo, ssk] 6 times, yo, k1, repeat from * (multiple of 16 sts).