Shown with a cast-on count of 18 stitches.  

• Rows 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, and 25 (RS): Knit.
• Row 2: [K1, yo] twice, k2tog, yo, k2tog, k11, turn (18 sts).
• Row 4: K1, yo, k3, [yo, k2tog] twice, k9, turn.
• Row 6: K1, yo, k5, [yo, k2tog] twice, k7, turn.
• Row 8: K2tog, yo, k2tog, k1, k2tog, yo, k2tog, yo, k8, turn (16 sts).
• Row 10: K2tog, yo, k3tog, yo, k2tog, yo, k8, turn (14 sts).
• Row 12: K2tog, yo, k3tog, yo, k8, turn (12 sts).
• Row 14: [K1, yo] twice, k2tog, yo, k2tog, k5, turn.
• Row 16: K1, yo, k3, [yo, k2tog] twice, k3, turn.
• Row 18: K1, yo, k5, [yo, k2tog] twice, k1, turn.
• Row 20: K2tog, yo, k2tog, k1, k2tog, yo, k2tog, yo, k2, turn (10 sts).
• Row 22: K2tog, yo, k3tog, yo, k2tog, yo, k2, turn (8 sts).
• Row 24: K2tog, yo, k3tog, yo, k2, turn (6 sts).
• Row 26: Knit (0 more sts).