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A290167
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Number of complete non-collateral matches with lattice points on the edges of an n X n square (symmetries and rotations excluded).
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2
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1, 5, 121, 9598, 1679181, 453504350, 172005077014, 86949091994273, 56483442337203525, 45847249692285567451, 45469223124152747878400, 54099446571414415140387750, 76055371931321606140937295538, 124721482827599093214246240617246
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Points on the sides of a 2 X 2 square can be matched in 13 different ways, if matching two points on the same side is not allowed. Only 5 of these are not symmetries or reflections of the others, so a(2) = 5.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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