Shown with a cast-on count of 3 stitches.  

• Row 0 (RS): [1-To-4 inc] 3 times (12 sts).
• Rows 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, and 21: K3, purl to last 3 sts, k3.
• Row 2: K3, *yo, k1, repeat from * to last 3 sts, k3 (18 sts).
• Row 4: K3, yo, knit to last 3 sts, yo, k3 (20 sts).
• Row 6: K3, [yo, k1] 14 times, k3 (34 sts).
• Row 8: K3, yo, knit to last 3 sts, yo, k3 (36 sts).
• Row 10: K3, [yo, k1] 6 times, [k2tog] 3 times, [yo, k1] 6 times, [k2tog] 3 times, [k1, yo] 6 times, k3 (48 sts).
• Row 12: K3, knit to last 3 sts, k3.
• Row 14: K6, *[k2tog] 3 times, [yo, k1] 6 times, [k2tog] 3 times, repeat from * to last 6 sts, k6.
• Row 16: K3, yo, k3, *yo, k18, repeat from * to last 6 sts, yo, k3, yo, k3 (53 sts).
• Row 18: K7, *k1, [k2tog] 3 times, [yo, k1] 6 times, [k2tog] 3 times, repeat from * to last 8 sts, k8.
• Row 20: K3, yo, k4, *yo, k19, repeat from * to last 8 sts, yo, k8 (57 sts).