Shown with a cast-on count of 5 stitches.  

• Round 1: K1, yo, k1, ctr dbl inc, k1, yo, k1 (9 sts).
• Round 3: K1, yo, 1/1 RC, k1, k1, k1, 1/1 LC, yo, k1 (11 sts).
• Round 5: K1, yo, 1/1 RC, k2tog, yo, ctr dbl inc, yo, ssk, 1/1 LC, yo, k1 (15 sts).
• Round 7: K1, yo, 1/1 RC, k2tog, yo, k2tog, k1 tbl, ssk, yo, ssk, 1/1 LC, yo, k1.
• Round 9: K1, yo, 1/1 RC, k2tog, yo, k2tog, yo, k1 tbl, yo, ssk, yo, ssk, 1/1 LC, yo, k1 (17 sts).
• Round 11: K1, yo, 1/1 RC, k2tog, yo, k2tog, k1, yo, k1 tbl, yo, k1, ssk, yo, ssk, 1/1 LC, yo, k1 (19 sts).
• Round 13: K1, yo, 1/1 RC, k2tog, yo, k2tog, k2, yo, k1 tbl, yo, k2, ssk, yo, ssk, 1/1 LC, yo, k1 (21 sts).
• Round 15: K1, 1/1 RC, k2tog, yo, k2tog, k3, yo, k1 tbl, yo, k3, ssk, yo, ssk, 1/1 LC, k1.
• Round 17: K1, k1 tbl, k2tog, yo, k2tog, k4, yo, k1 tbl, yo, k4, ssk, yo, ssk, k1 tbl, k1.
• Round 19: K1, k1 tbl, k2tog, yo, k1 tbl, k5, yo, k1 tbl, yo, k5, k1 tbl, yo, ssk, k1 tbl, k1 (23 sts).
• Round 21: K1, yo, ssk, yo, ssk, k13, k2tog, yo, k2tog, yo, k1.
• Round 23: K2, ssk, yo, k1 tbl, k13, k1 tbl, yo, k2tog, k2.
• Round 25: K2, yo, ssk, yo, ssk, k11, k2tog, yo, k2tog, yo, k2.
• Round 27: K3, ssk, yo, k1 tbl, k11, k1 tbl, yo, k2tog, k3.
• Round 29: K3, yo, ssk, yo, ssk, k9, k2tog, yo, k2tog, yo, k3.
• Round 31: K4, ssk, yo, k1 tbl, k9, k1 tbl, yo, k2tog, k4.
• Round 33: K4, yo, ssk, yo, ssk, k7, k2tog, yo, k2tog, yo, k4.
• Round 35: K5, ssk, yo, k1 tbl, k7, k1 tbl, yo, k2tog, k5.
• Round 37: K5, yo, ssk, yo, ssk, k5, k2tog, yo, k2tog, yo, k5.
• Round 39: K6, ssk, yo, k1 tbl, k5, k1 tbl, yo, k2tog, k6.
• Round 41: K6, yo, ssk, yo, ssk, k3, k2tog, yo, k2tog, yo, k6.
• Round 43: K7, ssk, yo, k1 tbl, k3, k1 tbl, yo, k2tog, k7.
• Round 45: K7, yo, ssk, yo, ssk, k1, k2tog, yo, k2tog, yo, k7.
• Round 47: K8, ssk, yo, k1 tbl, k1, k1 tbl, yo, k2tog, k8.
• Round 49: K8, ssk, yo, sl2-k1-p2sso, yo, k2tog, k8 (21 sts).