Shown with a cast-on count of 3 stitches.  

• Row 3 (RS): Pfb, purl to last st, pfb (5 sts).
• Row 4: K1, ctr dbl inc, k1, ctr dbl inc, k1 (9 sts).
• Rows 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, and 27: Purl.
• Row 6: K1, kfb, k1, kfb, k1, kfb, k1, kfb, k1 (13 sts).
• Row 8: K1, kfb, k9, kfb, k1 (15 sts).
• Row 10: K1, kfb, k2, kfb, k2, kfb, k2, kfb, k2, kfb, k1 (20 sts).
• Row 12: K1, kfb, k16, kfb, k1 (22 sts).
• Row 14: K1, kfb, k18, kfb, k1 (24 sts).
• Row 16: K1, kfb, [k1, kfb] 9 times, knit to last 3 sts, kfb, kfb, k1 (36 sts).
• Row 18: K1, kfb, k1, [k2tog, k1] 10 times, k1, kfb, k1 (28 sts).
• Row 20: K1, kfb, [kfb, k1] 12 times, kfb, k1 (42 sts).
• Row 22: K1, kfb, k2, [k2tog, k1] 12 times, kfb, k1 (32 sts).
• Row 24: K1, kfb, [k1, kfb] 14 times, kfb, k1 (48 sts).
• Row 26: K1, kfb, [k1, k2tog] 14 times, k2, kfb, k1 (36 sts).