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A156444
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Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 7.
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0
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6, 0, 616, 635, 78688, 149480, 17605696, 69492920, 8671131376, 72256187200, 10754086795840, 162770370597240, 31157969676392800, 681286019507189376
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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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