21, with the row row row in the round (copy) debug

Shown with a cast-on count of 13 stitches.   Getting chart...

  • Row 1 (RS): P3, yo, p1, yo, p2, p2tog tbl, p3, p2tog tbl.
  • Row 2: K1, k2tog, yo, k1, ssk, yo, k1, yo, k1, yo, k1, yo, k1, yo, ssk, k1 (16 sts).
  • Row 3: K1, k1 tbl, yo, ssk, k1, k2tog, yo, k1 tbl, k1, k1 tbl, k1, k1 tbl, yo, ssk, k1 tbl, k1.
  • Row 4: K1 tbl, k1, k1 tbl, yo, ssk, k1 tbl, k1, k1 tbl, yo, k3tog, k1 tbl, yo, ssk, k1 tbl, k1 (15 sts).
  • Row 5: K3, k1 tbl, yo, k1 tbl, yo, k1 tbl, yo, k1 tbl, yo, k3tog tbl, k3, k1 tbl, yo, k1 tbl (18 sts).
  • Row 6: K1 tbl, k3, k1 tbl, yo, ssk, k1, k1 tbl, k1, k1 tbl, yo, ssk, k1 tbl, k3, k1 tbl.
  • Row 7: K1 tbl, yo, ssk, k3, k1 tbl, yo, ssk, k3, k1 tbl, yo, sl1-k2tog-psso, yo, k1 tbl, k1.
  • Row 8: K3, yo, k2tog, yo, sl2-k1-p2sso, yo, ssk, k1, k2tog, yo, k1 tbl, yo, sl1-k2tog-psso, yo, k1 tbl (17 sts).
  • Row 9: K1 tbl, k2, yo, ssk, k1, k2tog, yo, k1, yo, ssk, k1, k2tog, yo, k2tog tbl, k1 (16 sts).
  • Row 10: Sl1 wyif, p2 tbl, p1, p1 tbl, p11.
  • Row 11: K1, ssk, yo, k1 tbl, ssk, yo, k1 tbl, ssk, yo, k3, yo, k1, yo, k1 tbl, yo, k1, yo, k1 tbl (20 sts).