Shown with a cast-on count of 19 stitches.  

• Row 1 (RS): *K1, yo, ssk, k1, k2tog, yo, repeat from * to last st, k1.
• Rows 2, 4, 6, 10, 12, and 14: Purl.
• Row 3: K1, *yo, k1, sl1-k2tog-psso, k1, yo, k1, repeat from *.
• Row 5: K1, *k2tog, yo, k1, yo, ssk, k1, repeat from *.
• Row 7: K2tog, [k1, yo] twice, k1, *sl1-k2tog-psso, [k1, yo] twice, k1, repeat from * to last 2 sts, ssk.
• Row 8: P1, yo, *p5, yo, p1, yo, repeat from * to last 6 sts, p5, yo, p1 (25 sts).
• Row 9: [K1, yo] twice, [ssk, k1, k2tog, yo, k1, yo, k1, yo, k1, yo] twice, ssk, k1, k2tog, [yo, k1] twice (31 sts).
• Row 11: [K1, yo] 3 times, k1, [sl1-k2tog-psso, k1, yo, k1, yo, k3, yo, k1, yo, k1] twice, sl1-k2tog-psso, [k1, yo] 3 times, k1 (39 sts).
• Row 13: K2, *yo, ssk, k1, k2tog, yo, k1, repeat from * to last st, k1.
• Row 15: K2tog, k1, yo, *sl1-k2tog-psso, [k1, yo] twice, k1, repeat from * to last 6 sts, sl1-k2tog-psso, k1, yo, ssk (37 sts).