Shown with a cast-on count of 5 stitches.  

• Row 1 (RS): K2, yo, k1, yo, k2 (7 sts).
• Row 2: K2, p3, k2.
• Row 3: K3, yo, k1, yo, k3 (9 sts).
• Rows 4 and 6: K2, p5, k2.
• Row 5: K2, k2tog, yo, k1, yo, ssk, k2.
• Row 7: K4, yo, k1, yo, k4 (11 sts).
• Rows 8 and 10: K3, p5, k3.
• Row 9: K3, k2tog, yo, k1, yo, ssk, k3.
• Row 11: K5, yo, k1, yo, k5 (13 sts).
• Rows 12 and 14: K4, p5, k4.
• Row 13: K4, k2tog, yo, k1, yo, ssk, k4.
• Row 15: K6, yo, k1, yo, k6 (15 sts).
• Row 16: K5, p5, k5.