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A156439
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Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 5.
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0
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2, 3, 0, 0, 480, 2400, 0, 0, 7574400, 66083040, 0, 0, 896812758240, 10058239033920, 0, 0, 374736233227188672, 5125335197750964000, 0, 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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