Shown with a cast-on count of 7 stitches.  

• Row 1 (RS): K2, yo, kfb, yo, k1, yo, kfb, yo, k2 (13 sts).
• Rows 2, 4, 6, 8, 10, 12, 14, 16, and 18: K2, purl to last 2 sts, k2.
• Row 3: K2, yo, k4, yo, k1, yo, k4, yo, k2 (17 sts).
• Row 5: K2, yo, k6, yo, k1, yo, k6, yo, k2 (21 sts).
• Row 7: K2, yo, k8, yo, k1, yo, k8, yo, k2 (25 sts).
• Row 9: K2, yo, k10, yo, k1, yo, k10, yo, k2 (29 sts).
• Row 11: K2, yo, k12, yo, k1, yo, k12, yo, k2 (33 sts).
• Row 13: K2, yo, k14, yo, k1, yo, k14, yo, k2 (37 sts).
• Row 15: K2, yo, k16, yo, k1, yo, k16, yo, k2 (41 sts).
• Row 17: K2, yo, k18, yo, k1, yo, k18, yo, k2 (45 sts).
• Row 19: K2, yo, k20, yo, k1, yo, k20, yo, k2 (49 sts).
• Rows 20, 22, 24, 26, 28, and 30: Knit.
• Row 21: K2, yo, k22, yo, k1, yo, k22, yo, k2 (53 sts).
• Row 23: K2, yo, k24, yo, k1, yo, k24, yo, k2 (57 sts).
• Row 25: K2, yo, k26, yo, k1, yo, k26, yo, k2 (61 sts).
• Row 27: K2, yo, k28, yo, k1, yo, k28, yo, k2 (65 sts).
• Row 29: K2, yo, k30, yo, k1, yo, k30, yo, k2 (69 sts).