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Search: id:A156469
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| A156469 |
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Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 18. |
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1
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| 1, 4, 54, 112, 5414, 21624, 2133044, 23029656, 5468265896, 163052061000, 97305384072800
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