Shown with a cast-on count of 39 stitches.  

• Rows 0, 2, 6, 8, and 10 (RS): K1, [brSl, k1] 19 times.
• Row 1: BrSl, [k3tog, brSl, ctr dbl inc, brSl, ctr dbl inc, brSl, k3tog, brSl] twice, k3tog, brSl, ctr dbl inc, brSl, ctr dbl inc, brSl, k3tog, brSl, k1, brSl.
• Rows 3 and 7: BrSl, k1, brSl, k3tog, brSl, [ctr dbl inc, brSl, ctr dbl inc, brSl, k3tog, brSl, k3tog, brSl] twice, ctr dbl inc, brSl, ctr dbl inc, brSl, k3tog, brSl.
• Row 4: K1, [brSl, k1] 7 times, [brSl, k1] 7 times, [brSl, k1] 5 times.
• Rows 5 and 9: BrSl, k3tog, brSl, [ctr dbl inc, brSl, ctr dbl inc, brSl, k3tog, brSl, k3tog, brSl] twice, ctr dbl inc, brSl, ctr dbl inc, brSl, k3tog, brSl, k1, brSl.