Shown with a cast-on count of 42 stitches.  

• Rows 1 and 20 (RS): K42.
• Rows 2, 4, 6, 8, 23, 25, 27, and 34: K21, turn (21 sts).
• Rows 3, 22, and 35: K16, turn (16 sts).
• Rows 5, 24, and 33: K18, turn (18 sts).
• Rows 7 and 26: K19, turn (19 sts).
• Row 9: K20, turn (20 sts).
• Row 11: K20, turn.
• Rows 12, 14, 16, and 31: K21, turn (21 sts).
• Rows 13 and 32: K19, turn (19 sts).
• Row 15: K18, turn (18 sts).
• Row 17: K16, turn (16 sts).
• Row 18: K21 (21 sts).
• Row 19: K42 (42 sts).
• Row 21: K31, turn (31 sts).
• Row 29: K21, turn.
• Row 30: K20, turn (20 sts).
• Row 36: K17 (17 sts).