Shown with a cast-on count of 5 stitches.  

• Row 1 (RS): Knit.
• Rows 2, 4, 6, and 8: Purl.
• Row 3: K1, (k1, yo, k1) in next st, k1, (k1, yo, k1) in next st, k1 (9 sts).
• Row 5: K2, (k1, yo, k1) in next st, k3, (k1, yo, k1) in next st, k2 (13 sts).
• Row 7: K3, (k1, yo, k1) in next st, k5, (k1, yo, k1) in next st, k3 (17 sts).