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A171012
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Number of ways to place two non-attacking wazirs on all free n-ominoes.
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0
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OFFSET
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1,3
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LINKS
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EXAMPLE
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E.g. the triomino XXX admits 1 combination of 2 non-attacking wazirs.
The triomino XX admits 1 combination of 2 non-attacking wazirs.
............ X
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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