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A156450
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Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 9.
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0
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1, 0, 0, 4, 4, 0, 0, 1836, 6871, 0, 0, 294400160, 3360660500, 0, 0, 2033591738777760, 62993444371397120, 0
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OFFSET
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1,4
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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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