Shown with a cast-on count of 11 stitches.  

• Row 1 (RS): K3, yo, k5, yo, k3 (13 sts).
• Row 2: K3, yo, p7, yo, k3 (15 sts).
• Row 3: K3, yo, [k1, yo] 9 times, k3 (25 sts).
• Row 4: K3, yo, p19, yo, k3 (27 sts).
• Row 5: K3, yo, k21, yo, k3 (29 sts).
• Row 6: K3, yo, p23, yo, k3 (31 sts).
• Row 7: K3, yo, k25, yo, k3 (33 sts).
• Row 8: K3, yo, p27, yo, k3 (35 sts).
• Row 9: K3, yo, [k1, yo] 29 times, k3 (65 sts).
• Row 10: K3, yo, p59, yo, k3 (67 sts).
• Row 11: K3, yo, k61, yo, k3 (69 sts).
• Row 12: K3, yo, p63, yo, k3 (71 sts).
• Row 13: K3, yo, k65, yo, k3 (73 sts).
• Row 14: K3, yo, p67, yo, k3 (75 sts).
• Row 15: K3, yo, k69, yo, k3 (77 sts).
• Row 16: K3, yo, p71, yo, k3 (79 sts).
• Row 17: K3, yo, k73, yo, k3 (81 sts).
• Row 18: K3, yo, p75, yo, k3 (83 sts).