Shown with a cast-on count of 3 stitches.  

• Row 1 (RS): K1, kfb, p1 (4 sts).
• Row 2: Sl1 wyif, kfb, k1, p1 (5 sts).
• Row 3: Sl1 wyib, kfb, knit to last st, p1 (6 sts).
• Row 4: Sl1 wyib, kfb, knit to last st, p1 (7 sts).
• Row 5: Sl1 wyib, kfb, knit to last st, p1 (8 sts).
• Row 6: Sl1 wyif, k3, yo, knit to last st, p1 (9 sts).
• Row 7: Sl1 wyif, k3, yo, knit to last st, p1 (10 sts).
• Row 8: Sl1 wyif, k3, yo, knit to last st, p1 (11 sts).
• Row 9: Sl1 wyif, k3, yo, knit to last st, p1 (12 sts).
• Row 10: Sl1 wyif, k3, yo, k3, p1, k3, p1 (13 sts).
• Row 11: Sl1 wyib, k3, yo, p1, k3, p1, k3, p1 (14 sts).
• Row 12: Sl1 wyif, k3, yo, p1, k3, p2, k3, p1 (15 sts).
• Row 13: Sl1 wyib, k3, yo, p2, k3, p2, k3, p1 (16 sts).
• Row 14: Sl1 wyif, k3, yo, p2, k3, p3, k3, p1 (17 sts).
• Row 15: Sl1 wyib, k3, yo, p3, k3, p3, k3, p1 (18 sts).