Shown with a cast-on count of 15 stitches.  

• Row 1 (RS): [K1, yo] twice, k1, [yo, k2tog] twice, ctr dbl inc, [ssk, yo] twice, k1, yo, k1, yo, k1 (21 sts).
• Row 2: K1, p9, k1, p9, k1.
• Row 3: [K1, yo] twice, k1, [yo, k2tog] 3 times, yo, k1, ctr dbl inc, k1, yo, [ssk, yo] 3 times, k1, yo, k1, yo, k1 (29 sts).
• Row 4: K1, p13, k1, p13, k1.
• Row 5: [K1, yo] twice, k1, [yo, k2tog] 5 times, yo, k1, ctr dbl inc, k1, yo, [ssk, yo] 5 times, k1, yo, k1, yo, k1 (37 sts).
• Row 6: K1, p17, k1, p17, k1.
• Row 7: [K1, yo] twice, k1, [yo, k2tog] 7 times, yo, k1, ctr dbl inc, k1, yo, [ssk, yo] 7 times, k1, yo, k1, yo, k1 (45 sts).
• Row 8: K1, p21, k1, p21, k1.