Shown with a cast-on count of 0 stitches.  

• Row 0 (RS): CO 20 sts (20 sts).
• Rounds 1-6: [K1, p1] 10 times.
• Round 7: K9, p1, k10.
• Round 8: K2, M1L, k5, M1R, k1, 1/1 LC, k2, M1L, k5, M1R, k3 (24 sts).
• Rounds 9-11: K24.
• Round 12: K9, M1R, k2, 1/1 RC, k1, M1L, k10 (26 sts).
• Rounds 13-15: K26.
• Round 16: K10, M1R, k1, 1/1 LC, k2, M1L, k11 (28 sts).
• Rounds 17-19: K28.
• Round 20: K2, M1L, k9, M1R, k2, 1/1 RC, k1, M1L, k9, M1R, k3 (32 sts).
• Round 21: K32.
• Round 22: K13, M1R, k1, 1/1 LC, k2, M1L, k14 (34 sts).
• Round 23: K34.
• Round 24: K14, M1R, k2, 1/1 RC, k1, M1L, k15 (36 sts).
• Round 25: K36.
• Round 26: K15, M1R, k1, 1/1 LC, k2, M1L, k16 (38 sts).
• Round 27: K38.
• Round 28: K16, M1R, k2, 1/1 RC, k1, M1L, k17 (40 sts).
• Round 29: K17, M1R, k5, M1L, k18 (42 sts).
• Round 30: K18, M1R, k1, 1/1 LC, k2, M1L, k19 (44 sts).
• Round 31: K19, M1R, k5, M1L, k20 (46 sts).
• Round 32: K20, M1R, k2, 1/1 RC, k1, M1L, k21 (48 sts).
• Round 33: K21, M1R, k5, M1L, k22 (50 sts).
• Round 34: K22, M1R, k1, 1/1 LC, k2, M1L, k23 (52 sts).
• Round 35: K23, M1R, k5, M1L, k24 (54 sts).
• Round 36: K24, M1R, k2, 1/1 RC, k1, M1L, k25 (56 sts).
• Round 37: K20, M1R, k5, M1R, k5, M1L, k5, M1L, k21 (60 sts).
• Round 38: K27, M1R, k1, 1/1 LC, k2, M1L, k28 (62 sts).
• Round 39: K23, M1R, k5, M1R, k5, M1L, k5, M1L, k24 (66 sts).
• Round 40: K30, M1R, k2, 1/1 RC, k1, M1L, k31 (68 sts).