Shown with a cast-on count of 2 stitches.  

• Row 1 (RS): K2.
• Row 2: [Ctr dbl inc] twice (6 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] twice (10 sts).
• Row 10: [P2, ctr dbl inc, p2] twice (14 sts).
• Row 14: [P3, ctr dbl inc, p3] twice (18 sts).
• Row 18: [P4, ctr dbl inc, p4] twice (22 sts).
• Row 22: [P5, ctr dbl inc, p5] twice (26 sts).
• Row 26: [P6, ctr dbl inc, p6] twice (30 sts).