Shown with a cast-on count of 5 stitches.  

• Row 0 (RS): K5.
• Row 1 (RS): K1, yo, k1, yo, k1, yo, k1, yo, k1 (9 sts).
• Row 2: K1, yo, k7, yo, k1 (11 sts).
• Row 3: K1, yo, k4, yo, k1, yo, k4, yo, k1 (15 sts).
• Row 4: K1, yo, knit to last st, yo, k1 (17 sts).
• Row 5: K1, yo, k7, yo, k1, yo, k7, yo, k1 (21 sts).