Shown with a cast-on count of 8 stitches.  

• Round 1: K8.
• Round 2: [K1, ctr dbl inc] 4 times (16 sts).
• Rounds 3, 5, 7, 9, 11, 13, 15, 17, and 19: Knit.
• Round 4: K2, incL, yo, [k4, incL, yo] 3 times, k2 (24 sts).
• Round 6: [K6, incL, yo] 4 times (32 sts).
• Round 8: K4, incL, yo, [k8, incL, yo] 3 times, k4 (40 sts).
• Round 10: [K10, incL, yo] 4 times (48 sts).
• Round 12: [K12, incL, yo] 4 times (56 sts).
• Round 14: [K14, incL, yo] 4 times (64 sts).
• Round 16: [K16, incL, yo] 4 times (72 sts).
• Round 18: [K18, incL, yo] 4 times (80 sts).