Shown with a cast-on count of 1 stitch.  

• Row 1 (RS): Ctr dbl inc (3 sts).
• Row 2: (P1, k1, p1) in next st, p1, (p1, k1, p1) in next st (7 sts).
• Row 3: K1, p1, k1, ctr dbl inc, k1, p1, k1 (9 sts).
• Row 4: P1, (p1, k1, p1) in next st, p1, p3, p1, (p1, k1, p1) in next st, p1 (13 sts).
• Row 5: K2, p1, k2, kfb, k1, kfb, k2, p1, k2 (15 sts).
• Row 6: P2, ctr dbl inc, p2, p5, p2, ctr dbl inc, p2 (19 sts).
• Row 7: K2, p3, k2, kfb, k3, kfb, k2, p3, k2 (21 sts).
• Row 8: P2, k1, ctr dbl inc, k1, p2, p7, p2, k1, ctr dbl inc, k1, p2 (25 sts).
• Row 9: K2, p2, ctr dbl inc, p2, k2, kfb, k5, kfb, k2, p2, ctr dbl inc, p2, k2 (31 sts).
• Row 10: P2, k2, p1, (p1, k1, p1) in next st, p1, k2, p2, p9, p2, k2, p1, (p1, k1, p1) in next st, p1, k2, p2 (35 sts).
• Row 11: K2, p2, k2, p1, k2, p2, k2, kfb, k7, kfb, k2, p2, k2, p1, k2, p2, k2 (37 sts).