Knitted in a multiple of 18 plus 1 and a 32-row repeat.
Row 1 – right side: P1, *yo, sssk, k14, p1; rep from * to end. (Multiple of 17, +1)
Row 2 and all wrong side rows: Knit the knit stitches and yarn over, purl the purl stitches.
Row 3: P1, *yo, k1, yo, sssk, k12, p1; rep from * to end.
Row 5: P1, *yo, k1, yo, k2, yo, sssk, k10, p1; rep from * to end. (Multiple of 18, +1)
Row 7: P1, *yo, k1, yo, k2, yo, k3, yo, sssk, k8, p1; rep from * to end. (Multiple of 20, +1)
Row 9: P1, *k1, yo, k2, yo, k3, yo, k4, sssk, k6, p1; rep from * to end. (Multiple of 21, +1)
Row 11: P1, *k2, yo, k3, yo, k8, sssk, k4, p1; rep from * to end.
Row 13: P1, *k3, yo, k12, sssk, k2, p1; rep from * to end. (Multiple of 20, +1)
Row 15: P1, *k16, sssk, p1; rep from * to end. (Multiple of 18, +1)
Row 17: P1, *k14, k3tog, yo, p1; rep from * to end. (Multiple of 17, +1)
Row 19: P1, *k12, k3tog, yo, k1, yo, p1; rep from * to end.
Row 21: P1, *k10, k3tog, yo, k2, yo, k1, yo, p1; rep from * to end. (Multiple of 18, +1)
Row 23: P1, *k8, k3tog, yo, k3, yo, k2, yo, k1, yo, p1; rep from * to end. (Multiple of 20, +1)
Row 25: P1, *k6, k3tog, k4, yo, k3, yo, k2, yo, k1, p1; rep from * to end. (Multiple of 21, +1)
Row 27: P1, *k4, k3tog, k8, yo, k3, yo, k2, p1; rep from * to end.
Row 29: P1, *k2, k3tog, k12, yo, k3, p1; rep from * to end. (Multiple of 20, +1)
Row 31: P1, *k3tog, k16, p1; rep from * to end. (Multiple of 18, +1)

Knitting abbreviations:
K: Knit | P: Purl | Yo: Yarn over.
K3tog: Knit 3 sts together | Sssk: Slip slip slip knit.