Shown with a cast-on count of 80 stitches.  

• Rounds 1-5: [K1, p1] 40 times.
• Rounds 6, 8, 10, 12, 14, 16, 18, and 20: Knit.
• Round 7: [K1, M1L, k12, M1R, k1, M1L, k26, M1R] twice (88 sts).
• Round 9: [K1, M1L, k14, M1R, k1, M1L, k28, M1R] twice (96 sts).
• Round 11: [K1, M1L, k16, M1R, k1, M1L, k30, M1R] twice (104 sts).
• Round 13: [K1, M1L, k18, M1R, k1, M1L, k32, M1R] twice (112 sts).
• Round 15: [K1, M1L, p20, M1R, k1, M1L, k34, M1R] twice (120 sts).
• Round 17: [K1, M1L, p22, M1R, k1, M1L, k36, M1R] twice (128 sts).
• Round 19: [K1, M1L, p24, M1R, k1, M1L, k38, M1R] twice (136 sts).
• Round 21: [K1, BO 26 sts, k40] twice (84 sts).