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Search: id:A156450
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| A156450 |
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Number of nXn arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 9. |
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1
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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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