Shown with a cast-on count of 5 stitches.  

• Row 1 (RS): Kfb, p1, k1, p1, k1 (6 sts).
• Row 2: P1, k1, p1, k1, k1, kfb (7 sts).
• Row 3: Kfb, k2, p1, k1, p1, k1 (8 sts).
• Row 4: P1, k1, p1, k1, k3, kfb (9 sts).
• Row 5: Kfb, knit to last 6 sts, k2tog, p1, k1, p1, k1.
• Rows 6 and 18: P1, k1, p1, k1, knit to last st, kfb (1 more st).
• Row 7: Kfb, knit to last 6 sts, k2tog, p1, yo, k1, yo, p1, k1 (2 more sts).
• Rows 8 and 16: P1, k1, p3, k1, knit to last st, kfb (1 more st).
• Row 9: Kfb, knit to last 8 sts, k2tog, p1, k1, yo, k1, yo, k1, p1, k1 (2 more sts).
• Rows 10 and 14: P1, k1, p5, k1, knit to last st, kfb (1 more st).
• Row 11: Kfb, knit to last 10 sts, k2tog, p1, k2, yo, k1, yo, k2, p1, k1 (2 more sts).
• Row 12: P1, k1, p7, k1, knit to last st, kfb (1 more st).
• Row 13: Kfb, knit to last 12 sts, k2tog, p1, ssk, k3, k2tog, p1, k1 (2 fewer sts).
• Row 15: Kfb, knit to last 10 sts, k2tog, p1, ssk, k1, k2tog, p1, k1 (2 fewer sts).
• Row 17: Kfb, knit to last 8 sts, k2tog, p1, sl1-k2tog-psso, p1, k1 (2 fewer sts).
• Repeat rows 5-18.