Shown with a cast-on count of 37 stitches.  

• Rows 1 and 5 (RS): *P3, k4tog, [yo, k1] 5 times, yo, k4tog, p2, repeat from * to last st, p1.
• Rows 2 and 4: K1, *k2, p13, k3, repeat from *.
• Row 3: *P3, k13, p2, repeat from * to last st, p1.
• Rows 6 and 8: K1, *k2, p4, k5, p4, k3, repeat from *.
• Row 7: *P3, k4, p5, k4, p2, repeat from * to last st, p1.
• Rows 9 and 13: *[K1, yo] 3 times, k4tog, p5, k4tog, [yo, k1] twice, yo, repeat from * to last st, k1.
• Rows 10, 12, 14, and 16: P1, *p6, k5, p7, repeat from *.
• Rows 11 and 15: *K7, p5, k6, repeat from * to last st, k1.