Shown with a cast-on count of 15 stitches.  

• Row 1 (RS): K3, yo, k2tog, k1, p2, yo, k1, yo, p2, k1, [yo] twice, k2tog, k1 (18 sts).
• Row 2: K3, p1, k3, p3, k5, yo, k2tog, k1.
• Row 3: K3, yo, k2tog, k1, p2, yo, k3, yo, p2, k5 (20 sts).
• Row 4: K7, p5, k5, yo, k2tog, k1.
• Row 5: K3, yo, k2tog, k1, p2, yo, k5, yo, p2, k1, [[yo] twice, k2tog] twice (24 sts).
• Row 6: [K2, p1] twice, k3, p7, k5, yo, k2tog, k1.
• Row 7: K3, yo, k2tog, k1, p2, k7tog, p2, k7 (18 sts).
• Row 8: K15, yo, k2tog, k1.
• Row 9: K3, yo, k2tog, k1, MK, p3, MK, k1, [[yo] twice, k2tog] 3 times (21 sts).
• Row 10: [K2, p1] 3 times, k9, yo, k2tog, k1.
• Row 11: K3, yo, k2tog, k1, p2, MK, p2, k10.
• Row 12: BO 6 sts, k11, yo, k2tog, k1 (15 sts).