Shown with a cast-on count of 16 stitches.  

• Row 1 (RS): K1, k2tog, M1R, k2tog, M1R, k2tog, 1-to-5 inc, ssk, M1L, ssk, M1L, ssk, M1L, ssk (18 sts).
• Rows 3, 7, and 11: K2tog, M1R, k2tog, M1R, k2tog, M1R, k2tog, (k1, yo, k1) in next st, ssk, M1L, ssk, M1L, ssk, M1L, ssk, k1.
• Rows 5 and 9: K2tog, M1R, k2tog, M1R, k2tog, M1R, k2tog, (k1, yo, k1) in next st, ssk, M1L, ssk, M1L, ssk, M1L, ssk, k1.
• Row 13: K2tog, M1R, k2tog, M1R, k2tog, M1R, k2tog, 1-to-5 inc, ssk, M1L, ssk, M1L, ssk, M1L, ssk, M1L, k1 (21 sts).
• Row 15: K2tog, M1R, k2tog, M1R, k2tog, M1R, k2tog, M1R, k2tog, (k1, yo, k1) in next st, k1, ssk, M1L, ssk, M1L, ssk, M1L, ssk, k1.