Shown with a cast-on count of 8 stitches.  

• Rounds 1-2: K8.
• Round 3: *(K1, yo, k1) in next st, p1, repeat from * (16 sts).
• Rounds 4, 6-8, 10-20, and 22-28: *K1, p1, repeat from *.
• Round 5: [K1, p1, k3tog, p1, (k1, yo, k1) in next st, p1] twice.
• Round 9: *(K1, yo, k1) in next st, p1, repeat from * (32 sts).
• Round 21: *(K1, yo, k1) in next st, p1, repeat from * (64 sts).