Shown with a cast-on count of 4 stitches.  

• Row 1 (RS): Knit.
• Row 2: P4.
• Row 3: Kfb, k2, kfb (6 sts).
• Rows 4, 6, 8, and 10: Purl.
• Row 5: Kfb, kfb, k2, kfb, kfb (10 sts).
• Row 7: Kfb, k2, kfb, k2, kfb, k2, kfb (14 sts).
• Row 9: Kfb, k4, kfb, k2, kfb, k4, kfb (18 sts).
• Row 11: Kfb, k6, kfb, k2, kfb, k6, kfb (22 sts).
• Row 12: P2, k1, p16, k1, p2.
• Row 13: Kfb, p1, k7, kfb, k2, kfb, k7, p1, kfb (26 sts).
• Row 14: [Yo] 11 times, p1, k2, p20, k2, p1, [yo] 10 times (47 sts).
• Row 15: P2, k6, p2, yo, k2tog, p2, k8, kfb, kfb, k8, p2, k2tog, yo, p2, k6, p2, k1 tbl (49 sts).