Shown with a cast-on count of 58 stitches.  

• Row 1 (RS): K1, *yo, k7, ssk, k2tog, k7, yo, k1, repeat from *.
• Rows 2 and 18: P2, *yo, p6, k2tog, ssk, p6, yo, p3, repeat from * to last 18 sts, yo, p6, k2tog, ssk, p6, yo, p2.
• Row 3: K3, *yo, k5, ssk, k2tog, k5, yo, k5, repeat from * to last 17 sts, yo, k5, ssk, k2tog, k5, yo, k3.
• Row 4: P4, *yo, p4, k2tog, ssk, p4, yo, p7, repeat from * to last 16 sts, yo, p4, k2tog, ssk, p4, yo, p4.
• Row 5: K5, *yo, k3, ssk, k2tog, k3, yo, k9, repeat from * to last 15 sts, yo, k3, ssk, k2tog, k3, yo, k5.
• Row 6: P6, *yo, p2, k2tog, ssk, p2, yo, p11, repeat from * to last 14 sts, yo, p2, k2tog, ssk, p2, yo, p6.
• Row 7: K7, *yo, k1, ssk, k2tog, k1, yo, k13, repeat from * to last 13 sts, yo, k1, ssk, k2tog, k1, yo, k7.
• Row 8: P8, *yo, k2tog, ssk, yo, p7, p8, repeat from * to last 12 sts, yo, k2tog, ssk, yo, p8.
• Row 9: K2tog, k7, *yo, ssk, yo, k7, ssk, k8, repeat from * to last 11 sts, yo, ssk, yo, k7, ssk (multiple of 19 sts, plus 19).
• Row 10: *Ssk, p6, yo, p3, yo, p6, k2tog, repeat from *.
• Row 11: *K2tog, k5, yo, k5, yo, k5, ssk, repeat from *.
• Row 12: *Ssk, p4, yo, p7, yo, p4, k2tog, repeat from *.
• Row 13: *K2tog, k3, yo, k9, yo, k3, ssk, repeat from *.
• Row 14: *Ssk, p2, yo, p11, yo, p2, k2tog, repeat from *.
• Row 15: *K2tog, k1, yo, k13, yo, k1, ssk, repeat from *.
• Row 16: *Ssk, yo, p7, p8, yo, k2tog, repeat from *.
• Row 17: K1, *yo, k7, ssk, k8, yo, ssk, repeat from * to last 18 sts, yo, k7, ssk, k8, yo, k1 (multiple of 19 sts, plus 20).
• Repeat rows 1-18.