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Search: id:A156457
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| A156457 |
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Number of nXn arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 12. |
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1
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| 1, 4, 0, 18, 90, 5154, 19368, 2108280, 31103100, 3164432181, 105602337600, 14188463179758, 817218706478195
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