Shown with a cast-on count of 3 stitches.  

• Row 1 (RS): P1, k1, p1.
• Row 2: P1, kfb, p1 (4 sts).
• Row 3: P1, [yo, k1] twice, yo, p1 (7 sts).
• Row 4: P2, [yo, k1] 3 times, yo, p2 (11 sts).
• Row 5: P2, [yo, k1] 7 times, yo, p2 (19 sts).
• Row 6: P2, [yo, k1] 15 times, yo, p2 (35 sts).
• Row 7: P2, [yo, k2] 7 times, yo, k3, [yo, k2] 7 times, yo, p2 (51 sts).
• Rows 8, 10, 12, 14, 16, 18, 20, and 22: Purl.
• Row 9: P2, [yo, k2] 10 times, yo, k7, [yo, k2] 10 times, yo, p2 (73 sts).
• Row 11: P2, yo, knit to last 2 sts, yo, p2 (75 sts).
• Row 13: P2, yo, knit to last 2 sts, yo, p2 (77 sts).
• Row 15: P2, yo, knit to last 2 sts, yo, p2 (79 sts).
• Row 17: P2, yo, knit to last 2 sts, yo, p2 (81 sts).
• Row 19: P2, yo, knit to last 2 sts, yo, p2 (83 sts).
• Row 21: P2, [yo, k2] 18 times, yo, k7, [yo, k2] 18 times, yo, p2 (121 sts).