Shown with a cast-on count of 48 stitches.  

• Row 1 (RS): Yo, k3, [yo, k1] 6 times, k3, *k3, [yo, k1] 6 times, k3, repeat from * to last 12 sts, k3, [yo, k1] 6 times, k3, yo (multiple of 18 sts, plus 38).
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, and 28: Knit.
• Rows 3, 7, 11, 15, 19, 23, and 27: Yo, knit, yo (2 more sts).
• Row 5: Yo, k2, k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, *k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, repeat from * to last 20 sts, k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, k2, yo (multiple of 18 sts, plus 42).
• Row 9: Yo, k3, k2tog, yo, k1, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, *k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, repeat from * to last 22 sts, k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, yo, k1, k2tog, k3, yo (multiple of 18 sts, plus 48).
• Row 13: Yo, k3, [yo, k1] twice, k2tog, *k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, repeat from * to last 7 sts, k2tog, [yo, k1] twice, k3, yo (multiple of 18 sts, plus 18).
• Row 17: Yo, k3, [yo, k1] 3 times, k2tog, k2tog, *k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, repeat from * to last 10 sts, k2tog, k2tog, [yo, k1] 3 times, k3, yo (multiple of 18 sts, plus 24).
• Row 21: Yo, k3, [yo, k1] 4 times, k2tog, k2tog, k2tog, *k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, repeat from * to last 13 sts, k2tog, k2tog, k2tog, [yo, k1] 4 times, k3, yo (multiple of 18 sts, plus 30).
• Row 25: Yo, k3, k2tog, [yo, k1] 5 times, k2tog, k2tog, k2tog, *k2tog, k2tog, k2tog, [yo, k1] 6 times, k2tog, k2tog, k2tog, repeat from * to last 16 sts, k2tog, k2tog, k2tog, [yo, k1] 5 times, k2tog, k3, yo (multiple of 18 sts, plus 36).