Shown with a cast-on count of 1 stitch.  

• Row 1 (RS): K1.
• Row 2: P1.
• Row 3: K1, yo (2 sts).
• Rows 4, 6, 8, 10, 12, 14, 16, 38, 40, and 42: Purl.
• Row 5: [K1, yo] twice (4 sts).
• Row 7: K1, yo, k3, yo (6 sts).
• Row 9: K1, yo, k5, yo (8 sts).
• Row 11: K1, yo, k7, yo (10 sts).
• Row 13: K1, yo, k9, yo (12 sts).
• Row 15: K1, yo, k11, yo (14 sts).
• Row 17: Ssk, yo, k4, sl1-k2tog-psso, k4, yo, p1, yo.
• Row 18: K3, p11.
• Row 19: Ssk, yo, k3, sl1-k2tog-psso, k3, yo, p3, yo.
• Row 20: K5, p9.
• Row 21: Ssk, yo, k2, sl1-k2tog-psso, k2, yo, p5, yo.
• Row 22: K7, p7.
• Row 23: Ssk, yo, k1, sl1-k2tog-psso, k1, yo, p7, yo.
• Row 24: K9, p5.
• Row 25: Ssk, yo, sl1-k2tog-psso, yo, p9, yo.
• Row 26: K11, p3.
• Row 27: Sl1-k2tog-psso, yo, p11, yo.
• Row 28: K13, p1.
• Row 29: Ssk, yo, p4, sl1-k2tog-psso, p4, yo, k1, yo.
• Row 30: P3, k9, p2.
• Row 31: Ssk, yo, p3, sl1-k2tog-psso, p3, yo, k3, yo.
• Row 32: P5, k7, p2.
• Row 33: Ssk, yo, p2, sl1-k2tog-psso, p2, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo.
• Row 34: P7, k5, p2.
• Row 35: Ssk, yo, p1, sl1-k2tog-psso, p1, yo, k3, yo, k1, yo, k3, yo (16 sts).
• Row 36: P11, k3, p2.
• Row 37: Ssk, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, sl1-k2tog-psso, yo, sl1-k2tog-psso, yo, k1, yo (14 sts).
• Row 39: Sl1-k2tog-psso, yo, k3, yo, k1, yo, k3, yo, k1, yo, k3, yo (18 sts).
• Row 41: Sl1-k2tog-psso, yo, sl1-k2tog-psso, yo, sl1-k2tog-psso, yo, sl1-k2tog-psso, yo, sl1-k2tog-psso, yo, sl1-k2tog-psso, yo (12 sts).