Knitted in a multiple of 18 sts, + 1 and a 14-row repeat.
Row 1- RS: P1, *k17, p1; rep from * to end.
Row 2: K1, *p17, k1; rep from * to end.
Row 3: P1, *k2tog, k6, yo, k1, yo, k6, ssk, p1; rep from * to end.
Row 4: K1, *ssp, p13, p2tog, k1; rep from * to end.
Row 5: P1, *k2tog, k4, (yo, k1) 3 times, yo, k4, ssk, p1; rep from * to end.
Row 6: K1, *ssp, p13, p2tog, k1; rep from * to end.
Row 7: P1, *k2tog, k2, * (yo, k1) 7 times, yo, k2, ssk, p1; rep from * to end.
Row 8: K1, *ssp, p17, p2tog, k1; rep from * to end.
Row 9: P1, *k2tog, k15, ssk, p1; rep from * to end.
Row 10: K1, *p17, k1; rep from * to end.
Row 11: P1, *k17, p1; rep from * to end.
Row 12: Knit.
Row 13: P1, * yo, k2tog; rep from * to end
Row 14: Knit.

Knitting abbreviations:
K: Knit | P: Purl | Yo: Yarn over.
K2tog: Knit 2 sts together | Ssk: Slip slip knit.
P2tog: Purl 2 sts together | Ssp: Slip slip purl.