369 Octominoes

Theorem

There exist $369$ distinct free octominoes, $6$ of which have a hole:

File:369Octominoes.png


Proof


This theorem requires a proof.
In particular: Work to be done yet to establish method of creation
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Sources

  • 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $35$
  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $35$
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