Shown with a cast-on count of 3 stitches.  

• Rows 1 and 3 (RS): K3.
• Rows 2 and 4: P3.
• Row 5: K1, M1L, k1, M1R, k1 (5 sts).
• Rows 6 and 8: P5.
• Row 7: K5.
• Row 9: Ctr dbl inc, k3, ctr dbl inc (9 sts).
• Rows 10 and 16: P9.
• Row 11: K3, cddp, k3 (7 sts).
• Row 12: P7.
• Row 13: Ctr dbl inc, k5, ctr dbl inc (11 sts).
• Row 14: P11.
• Row 15: K4, cddp, k4 (9 sts).