Shown with a cast-on count of 5 stitches.  

• Row 1 (WS): K2, p1, k2.
• Row 2: K2, yo, k1, yo, k2 (7 sts).
• Row 3: K2, p3, k2.
• Row 4: K2, yo, k1, yo, k1, yo, k1, yo, k2 (11 sts).
• Rows 5, 7, 9, 11, 13, 15, 17, 19, 21, and 23: K2, purl to last 2 sts, k2.
• Row 6: K2, yo, k3, yo, k1, yo, k3, yo, k2 (15 sts).
• Row 8: K2, yo, k5, yo, k1, yo, k5, yo, k2 (19 sts).
• Row 10: K2, yo, k7, yo, k1, yo, k7, yo, k2 (23 sts).
• Rows 12 and 24: Knit.
• Row 14: K2, yo, k9, yo, k1, yo, k9, yo, k2 (27 sts).
• Row 16: K2, yo, k11, yo, k1, yo, k11, yo, k2 (31 sts).
• Row 18: K2, yo, k13, yo, k1, yo, k13, yo, k2 (35 sts).
• Row 20: K2, yo, k15, yo, k1, yo, k15, yo, k2 (39 sts).
• Row 22: K2, yo, k17, yo, k1, yo, k17, yo, k2 (43 sts).