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Search: id:A156434
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| A156434 |
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Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 4. |
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1
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| 1, 2, 4, 11, 57, 1082, 42354, 2278938, 154294582, 12767337844, 1267231350044, 148617033979348, 20331541618406216
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