Shown with a cast-on count of 51 stitches.  

• Row 1 (RS): Kfb, k9, k3tog, k10, k3tog, k10, (k1, yo, k1) in next st, k9, (k1, yo, k1) in next st, k2, k2tog.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 3: Kfb, k8, k3tog, k8, k3tog, k10, (k1, yo, k1) in next st, k11, (k1, yo, k1) in next st, k3, k2tog.
• Row 5: Kfb, k7, k3tog, k6, k3tog, k10, (k1, yo, k1) in next st, k13, (k1, yo, k1) in next st, k4, k2tog.
• Row 7: Kfb, k6, k3tog, k4, k3tog, k10, (k1, yo, k1) in next st, k15, (k1, yo, k1) in next st, k5, k2tog.
• Row 9: Kfb, k5, k3tog, k4, sl1-k2tog-psso, k10, (k1, yo, k1) in next st, k15, (k1, yo, k1) in next st, k6, k2tog.
• Row 11: Kfb, k4, k3tog, k4, sl1-k2tog-psso, k10, (k1, yo, k1) in next st, k15, (k1, yo, k1) in next st, k7, k2tog.
• Row 13: Kfb, k3, k3tog, k4, sl1-k2tog-psso, k10, (k1, yo, k1) in next st, k15, (k1, yo, k1) in next st, k8, k2tog.
• Row 15: Kfb, k2, k3tog, k4, sl1-k2tog-psso, k10, (k1, yo, k1) in next st, k15, (k1, yo, k1) in next st, k9, k2tog.
• Row 17: Kfb, k3, sl1-k2tog-psso, k2, sl1-k2tog-psso, k10, (k1, yo, k1) in next st, k17, (k1, yo, k1) in next st, k8, k2tog.