Shown with a cast-on count of 33 stitches.  

• Row 1 (WS): K1, *brSl, [k1, brSl] 6 times, (k1, yo, k1) in next st, brSl, (k1, yo, k1) in next st, repeat from * (multiple of 20 sts, plus 1).
• Row 2: BrSl, *[k1, brSl] 5 times, k5tog, brSl, [k1, brSl] twice, repeat from * (multiple of 16 sts, plus 1).
• Rows 3, 7, 11, and 15: K1, *brSl, k1, repeat from *.
• Rows 4, 8, 12, and 16: BrSl, *k1, brSl, repeat from *.
• Row 5: *(K1, yo, k1) in next st, brSl, [k1, brSl] 6 times, (k1, yo, k1) in next st, brSl, repeat from * to last st, k1 (multiple of 20 sts, plus 1).
• Row 6: BrSl, *[k1, brSl] 4 times, k5tog, brSl, [k1, brSl] 3 times, repeat from * (multiple of 16 sts, plus 1).
• Row 9: *(K1, yo, k1) in next st, brSl, (k1, yo, k1) in next st, brSl, [k1, brSl] 6 times, repeat from * to last st, k1 (multiple of 20 sts, plus 1).
• Row 10: BrSl, *[k1, brSl] twice, k5tog, brSl, [k1, brSl] 5 times, repeat from * (multiple of 16 sts, plus 1).
• Row 13: *[K1, brSl] twice, (k1, yo, k1) in next st, brSl, (k1, yo, k1) in next st, brSl, [k1, brSl] 4 times, repeat from * to last st, k1 (multiple of 20 sts, plus 1).
• Row 14: BrSl, *k5tog, brSl, [k1, brSl] 7 times, repeat from * (multiple of 16 sts, plus 1).