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Image link broken; now fixed.
Joseph O'Rourke
  • 150.9k
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  • 958

I was having difficulty seeing Nathaniel Shar's (interesting!) pattern. This might be easier to interpret:
      fib500 inverted
(I thought it too intrusive to add this directly to his answer.)

Joseph O'Rourke
  • 150.9k
  • 36
  • 358
  • 958