Wera

The original chart shows round 18 with 128 stitches and round 20 over 126 so I added an extra knit stitch to the center areas (50 stitches instead of 49 as charted) and removed one of the YO on each side of the center section to keep the stitch count the same. Or you could do a double yarn over around the center block but only knit one stitch into it - making a larger hole :-) Swatch photo shows three repeats.

Shown with a cast-on count of 4 stitches.   Getting chart...

  • Round 1: K4.
  • Round 2: Yo, k4, yo (6 sts).
  • Round 3: Yo, k6, yo (8 sts).
  • Round 4: Yo, k8, yo (10 sts).
  • Round 5: Yo, k10, yo (12 sts).
  • Round 6: Yo, k12, yo (14 sts).
  • Round 7: Yo, k14, yo (16 sts).
  • Round 8: Yo, k16, yo (18 sts).
  • Round 9: Yo, k18, yo (20 sts).
  • Round 10: Yo, k20, yo (22 sts).
  • Round 11: Yo, k22, yo (24 sts).
  • Round 12: Yo, k24, yo (26 sts).
  • Round 13: K26.
  • Round 14: Kfb, [yo] 5 times, ssk, k20, k2tog, [yo] 5 times, kfb (36 sts).
  • Round 15: K3, p1, k1, p1, k24, p1, k1, p1, k3.
  • Round 16: K2, yo, yo, [k1, yo, yo] 5 times, ssk, k18, k2tog, yo, yo, [k1, yo, yo] 5 times, k2 (58 sts).
  • Round 17: K3, p1, [k1, p1, k1] 5 times, k21, p1, [k1, p1, k1] 5 times, k2.
  • Round 18: K2, yo, yo, [k1, yo, yo] 16 times, k1, yo, yo, ssk, k16, k2tog, yo, yo, [k1, yo, yo] 17 times, k2 (128 sts).
  • Round 19: K3, p1, [k2, p1] 17 times, k1, k16, [k2, p1] 18 times, k2.
  • Round 20: K3, yo, k50, k2tog, yo, ssk, k14, k2tog, yo, ssk, k50, yo, k3.
  • Rounds 21, 23, 25, 27, 29, and 31: K128.
  • Round 22: K4, yo, k50, k2tog, yo, ssk, k12, k2tog, yo, ssk, k50, yo, k4.
  • Round 24: K5, yo, k50, k2tog, yo, ssk, k10, k2tog, yo, ssk, k50, yo, k5.
  • Round 26: K6, yo, k50, k2tog, yo, ssk, k8, k2tog, yo, ssk, k50, yo, k6.
  • Round 28: K7, yo, k50, k2tog, yo, ssk, k6, k2tog, yo, ssk, k50, yo, k7.
  • Round 30: K8, yo, k50, k2tog, yo, ssk, k4, k2tog, yo, ssk, k50, yo, k8.