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Search: id:A156449
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| A156449 |
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Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 9. |
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| 1, 2, 4, 28, 68, 788, 2096, 74764, 297215, 56568904, 378230514, 110049447136, 1117730631388, 399699792848864, 6285859127170900, 2788382742936560544
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