Shown with a cast-on count of 2 stitches.  

• Round 1: K2.
• Round 2: [Kfb] twice (4 sts).
• Rounds 3, 5, 7-8, 10-11, 13-15, 17-19, 21-23, and 25-27: Knit.
• Round 4: K1, ctr dbl inc, k1, ctr dbl inc, k0 (8 sts).
• Round 6: K2, ctr dbl inc, k3, ctr dbl inc, k1 (12 sts).
• Round 9: K3, ctr dbl inc, k5, ctr dbl inc, k2 (16 sts).
• Round 12: K4, ctr dbl inc, k7, ctr dbl inc, k3 (20 sts).
• Round 16: K5, ctr dbl inc, k9, ctr dbl inc, k4 (24 sts).
• Round 20: K6, ctr dbl inc, k11, ctr dbl inc, k5 (28 sts).
• Round 24: K7, ctr dbl inc, k13, ctr dbl inc, k6 (32 sts).