1285 9-ominoes

Theorem

There exist $1285$ distinct free $9$-ominoes, $37$ of which have a hole:

File:1285-9ominoes.png


Proof


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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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