Shown with a cast-on count of 3 stitches.  

• Row 1 (RS): *K1, yo, repeat from * to last st, k1 (5 sts).
• Rows 2, 4, 6, 8, 10, 12, and 14: Purl.
• Row 3: K1, yo, k3, yo, k1 (7 sts).
• Row 5: [K1, yo] twice, [k1, yo] twice, [k1, yo] twice, k1 (13 sts).
• Rows 7 and 11: Knit.
• Row 9: K1, yo, [k3, yo, k1, yo] twice, k3, yo, k1 (19 sts).
• Row 13: K1, yo, [k5, yo, k1, yo] twice, k5, yo, k1 (25 sts).
• Row 16: Purl.