Shown with a cast-on count of 1 stitch.  

• Row 1 (RS): Yo, k1 (2 sts).
• Row 2: Yo, p2 (3 sts).
• Row 3: Yo, p1, yo, k1, yo, p1 (6 sts).
• Row 4: Yo, k1, p3, k2 (7 sts).
• Row 5: Yo, p2, k1, yo, k1, yo, k1, p2 (10 sts).
• Row 6: Yo, k2, p5, k3 (11 sts).
• Row 7: Yo, p3, k2, yo, k1, yo, k2, p3 (14 sts).
• Row 8: Yo, k3, p7, k4 (15 sts).
• Row 9: Yo, p4, k3, yo, k1, yo, k3, p4 (18 sts).
• Row 10: Yo, k4, p9, k5 (19 sts).
• Row 11: Yo, p5, k4, yo, k1, yo, k4, p5 (22 sts).
• Row 12: Yo, k5, p11, k6 (23 sts).
• Row 13: Yo, p6, k5, yo, k1, yo, k5, p6 (26 sts).
• Row 14: Yo, k6, p13, k7 (27 sts).
• Row 15: Yo, p7, k6, yo, k1, yo, k6, p7 (30 sts).
• Row 16: Yo, k7, p15, k8 (31 sts).
• Row 17: Yo, p8, k7, yo, k1, yo, k7, p8 (34 sts).
• Row 18: Yo, k8, p17, k9 (35 sts).