Shown with a cast-on count of 1 stitch.  

• Row 1 (RS): K1.
• Row 2: Ctr dbl inc (3 sts).
• Rows 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, and 29: Knit.
• Rows 4, 8, 12, 16, 20, 24, and 28: Purl.
• Row 6: K1, ctr dbl inc, k1 (5 sts).
• Row 10: P2, ctr dbl inc, p2 (7 sts).
• Row 14: P3, ctr dbl inc, p3 (9 sts).
• Row 18: P4, ctr dbl inc, p4 (11 sts).
• Row 22: P5, ctr dbl inc, p5 (13 sts).
• Row 26: P6, ctr dbl inc, p6 (15 sts).