Shown with a cast-on count of 12 stitches.  

• Row 1 (RS): K3, kfb, k1, kfb, kfb, k1, kfb, k3 (16 sts).
• Rows 2, 6, 10, and 14: K3, purl to last 3 sts, k3.
• Row 3: K3, kfb, yo, k3, yo, kfb, kfb, yo, k3, yo, kfb, k3 (24 sts).
• Row 4: K3, p2, p1 tbl, p3, p1 tbl, p4, p1 tbl, p3, p1 tbl, p2, k3.
• Row 5: K3, kfb, k7, kfb, kfb, k7, kfb, k3 (28 sts).
• Row 7: K3, kfb, yo, k9, yo, kfb, kfb, yo, k9, yo, kfb, k3 (36 sts).
• Row 8: K3, p2, p1 tbl, p9, p1 tbl, p4, p1 tbl, p9, p1 tbl, p2, k3.
• Row 9: K3, kfb, k13, kfb, kfb, k13, kfb, k3 (40 sts).
• Row 11: K3, kfb, yo, k15, yo, kfb, kfb, yo, k15, yo, kfb, k3 (48 sts).
• Row 12: K3, p2, p1 tbl, p15, p1 tbl, p4, p1 tbl, p15, p1 tbl, p2, k3.
• Row 13: K3, kfb, k19, kfb, kfb, k19, kfb, k3 (52 sts).
• Row 15: K3, kfb, yo, k21, yo, kfb, kfb, yo, k21, yo, kfb, k3 (60 sts).
• Row 16: K3, p2, p1 tbl, p21, p1 tbl, p4, p1 tbl, p21, p1 tbl, p2, k3.