Shown with a cast-on count of 31 stitches.  

• Row 1 (RS): K7, *[k2tog, yo] twice, k5, repeat from * to last 6 sts, [k2tog, yo] twice, k2.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, and 18: Purl.
• Row 3: K6, *[k2tog, yo] twice, k5, repeat from * to last 7 sts, [k2tog, yo] twice, k3.
• Row 5: K5, *[k2tog, yo] twice, k5, repeat from * to last 8 sts, [k2tog, yo] twice, k4.
• Row 7: K4, *[k2tog, yo] twice, k5, repeat from * to last 9 sts, [k2tog, yo] twice, k5.
• Row 9: K3, *[k2tog, yo] twice, k5, repeat from * to last 10 sts, [k2tog, yo] twice, k6.
• Row 11: K2, *[k2tog, yo] twice, k5, repeat from * to last 11 sts, [k2tog, yo] twice, k7.
• Row 13: K1, *[k2tog, yo] twice, k5, repeat from * to last 12 sts, [k2tog, yo] twice, k5, k2tog, yo, k1.
• Row 15: [K2tog, yo] twice, k5, *[k2tog, yo] twice, k5, repeat from * to last 4 sts, k2tog, yo, k2.
• Row 17: K1, k2tog, yo, k5, *[k2tog, yo] twice, k5, repeat from * to last 5 sts, [k2tog, yo] twice, k1.
• Repeat rows 1-18.