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A156442
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Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 6.
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0
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2, 0, 7, 0, 870, 0, 68180, 0, 18391220, 0, 10399874310, 0, 10075020851140, 0, 14707103186511120, 0
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OFFSET
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4,1
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LINKS
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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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