Shown with a cast-on count of 43 stitches.  

• Row 1 (RS): K12, *2/3 LC, k9, repeat from * to last 3 sts, k3.
• Rows 2 and 20: P3, *k9, p5, repeat from * to last 12 sts, k9, p3.
• Row 3: K1, *yo, k5, sl1-k2tog-psso, k5, yo, k1, repeat from *.
• Row 4: P4, *k7, p7, repeat from * to last 11 sts, k7, p4.
• Row 5: K2, *yo, k4, sl1-k2tog-psso, k4, yo, k3, repeat from * to last 13 sts, yo, k4, sl1-k2tog-psso, k4, yo, k2.
• Row 6: P5, *k5, p9, repeat from * to last 10 sts, k5, p5.
• Row 7: K3, *yo, k3, sl1-k2tog-psso, k3, yo, k5, repeat from * to last 12 sts, yo, k3, sl1-k2tog-psso, k3, yo, k3.
• Row 8: P6, *k3, p11, repeat from * to last 9 sts, k3, p6.
• Row 9: K4, *yo, k2, sl1-k2tog-psso, k2, yo, k7, repeat from * to last 11 sts, yo, k2, sl1-k2tog-psso, k2, yo, k4.
• Rows 10 and 12: K5, *p5, k9, repeat from * to last 10 sts, p5, k5.
• Row 11: K5, *2/3 LC, k9, repeat from * to last 10 sts, 2/3 LC, k5.
• Row 13: K2tog, k5, yo, *k1, yo, k5, sl1-k2tog-psso, k5, yo, repeat from * to last 8 sts, k1, yo, k5, ssk.
• Row 14: K4, *p7, k7, repeat from * to last 11 sts, p7, k4.
• Row 15: K2tog, k4, yo, *k3, yo, k4, sl1-k2tog-psso, k4, yo, repeat from * to last 9 sts, k3, yo, k4, ssk.
• Row 16: K3, *p9, k5, repeat from * to last 12 sts, p9, k3.
• Row 17: K2tog, k3, yo, *k5, yo, k3, sl1-k2tog-psso, k3, yo, repeat from * to last 10 sts, k5, yo, k3, ssk.
• Row 18: K2, *p11, k3, repeat from * to last 13 sts, p11, k2.
• Row 19: K2tog, k2, yo, *k7, yo, k2, sl1-k2tog-psso, k2, yo, repeat from * to last 11 sts, k7, yo, k2, ssk.
• Repeat rows 1-20.