Shown with a cast-on count of 2 stitches.  

• Row 1 (RS): [Yo, k1] twice, yo (5 sts).
• Row 2: [K1, p1] twice, k1.
• Row 3: [Yo, p1, k1] twice, yo, p1 (8 sts).
• Row 4: [K2, p1] twice, k2.
• Row 5: [P1, yo, p1, k1] twice, p1, yo, p1 (11 sts).
• Row 6: [K3, p1] twice, k3.
• Row 7: [P2, yo, p1, k1] twice, p2, yo, p1 (14 sts).
• Row 8: [K4, p1] twice, k4.
• Row 15: [P2, yo, p2, k1] twice, p2, yo, p1, p1 (17 sts).
• Row 16: [K5, p1] twice, k5.
• Row 17: [P2, yo, k1, p2, k1] twice, p2, yo, k1, p2 (20 sts).
• Row 18: [K6, p1] twice, k6.
• Row 20: [P2, k2tog, yo, p2, k1] twice, p2, k2tog, yo, p2.