Shown with a cast-on count of 39 stitches.  

• Rows 1 and 5 (WS): K1, *p1, k1, repeat from *.
• Row 2: CO 1 st, p1, k3tog, [p1, k1] 6 times, p1, ctr dbl inc, p1, k1, p1, ctr dbl inc, [p1, k1] 6 times, p1, sl1-k2tog-psso, p1, CO 1 st (41 sts).
• Rows 3 and 7: P1, *k1, p1, repeat from *.
• Row 4: CO 1 st, k1, p1, k3tog, [p1, k1] 6 times, p1, ctr dbl inc, p1, k1, p1, ctr dbl inc, [p1, k1] 6 times, p1, sl1-k2tog-psso, p1, k1, CO 1 st (43 sts).
• Row 6: CO 1 st, p1, k1, p1, k3tog, [p1, k1] 6 times, p1, ctr dbl inc, p1, k1, p1, ctr dbl inc, [p1, k1] 6 times, p1, sl1-k2tog-psso, p1, k1, p1, CO 1 st (45 sts).
• Row 8: CO 1 st, k1, p1, k1, p1, k3tog, [p1, k1] 6 times, p1, ctr dbl inc, p1, k1, p1, ctr dbl inc, [p1, k1] 6 times, p1, sl1-k2tog-psso, p1, k1, p1, k1, CO 1 st (47 sts).