Shown with a cast-on count of 3 stitches.  

• Row 1 (RS): K1, kfb, k1 (4 sts).
• Rows 2, 4, 6, 8, 12, 14, 16, 18, 22, 24, 26, 28, 32, 34, 36, 38, 42, 44, 46, and 48: Knit.
• Row 3: K1, kfb, kfb, k1 (6 sts).
• Rows 5 and 11: K1, kfb, k1, kfb, knit (8 sts).
• Rows 7 and 13: K1, kfb, k1, kfb, knit (10 sts).
• Rows 9, 15, and 21: K1, kfb, k1, kfb, knit (12 sts).
• Row 10: BO 6 sts, knit (6 sts).
• Rows 17 and 23: K1, kfb, k1, kfb, knit (14 sts).
• Rows 19, 25, and 31: K1, kfb, k1, kfb, knit (16 sts).
• Row 20: BO 6 sts, knit (10 sts).
• Rows 27 and 33: K1, kfb, k1, kfb, knit (18 sts).
• Rows 29 and 35: K1, kfb, k1, kfb, knit (20 sts).
• Row 30: BO 6 sts, knit (14 sts).
• Row 37: K1, kfb, k1, kfb, knit (22 sts).
• Row 39: K1, kfb, k1, kfb, knit (24 sts).
• Row 40: BO 6 sts, knit (18 sts).
• Rows 41, 43, 45, 47, and 49: K1, kfb, k1, kfb, knit (2 more sts).
• Row 50: BO 7 sts, knit (7 fewer sts).
• Repeat rows 41-50.