Shown with a cast-on count of 24 stitches.  

• Round 1: P19, pfb, p4 (25 sts).
• Round 2: P20, k1, p4.
• Round 3: P18, 1/2 RC, p4.
• Round 4: P18, k3, p4.
• Round 5: P16, 3/2 RC, p4.
• Round 6: P16, k3, pfb, k1, p4 (26 sts).
• Round 7: P14, 3/2 RPC, k3, p4.
• Round 8: P14, k3, p2, k3, p4.
• Round 9: P12, 3/2 RPC, 3/2 RC, p4.
• Round 10: P12, k3, p2, k3, pfb, k1, p4 (27 sts).
• Round 11: P10, 3/2 RPC, 3/2 RPC, k3, p4.
• Round 12: P10, k3, p2, k3, p2, k3, p4.
• Round 13: P8, 3/2 RPC, 3/2 RPC, 3/2 RPC, p4.
• Rounds 14-18: P8, k3, p2, k3, p2, k3, p6.
• Round 19: P8, 3/1 LPC, p1, 3/1 LPC, p1, 3/1 LPC, p5.
• Round 20: P9, k3, p2, k3, p2, k3, p5.
• Round 21: P9, 3/1 LPC, p1, 3/1 LPC, p1, 3/2 LPC, p3.
• Round 22: P10, k3, p2, k3, p3, k3, p3.
• Round 23: P10, 3/1 LPC, p1, 3/2 LPC, p1, 3/2 LPC, p1.
• Round 24: P11, k3, p3, k3, p3, k3, p1.
• Round 25: P11, 3/1 LPC, p2, 3/2 LPC, p1, 3/1 LPC.
• Rounds 26-30: P12, k3, p4, k3, p2, k3.
• Round 31: P11, 3/1 RPC, p3, 3/1 RPC, p1, 3/1 RPC.
• Round 32: P11, k3, p4, k3, p2, k3, p1.
• Round 33: P9, 3/2 RPC, p3, 3/1 RPC, p1, 3/1 RPC, p1.
• Round 34: P9, k3, p5, k3, p2, k3, p2.
• Round 35: P7, 3/2 RPC, p3, 3/2 RPC, p1, 3/1 RPC, p2.
• Round 36: P7, k3, p5, k3, p3, k3, p3.
• Round 37: P6, 3/1 RPC, p3, 3/2 RPC, p2, 3/1 RPC, p3.
• Rounds 38-41: P6, k3, p4, k3, p4, k3, p4.
• Round 42: P2, k1, p3, k3, p4, k3, p4, k3, p2, p2tog (26 sts).
• Round 43: 1/2 RC, p3, k3, p4, k3, p4, k3, p3.
• Rounds 44-45: K3, p3, k3, p4, k3, p4, k3, p3.