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Search: id:A033542
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| A033542 |
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a(n) = 2*(n^2)!* Product_{k = 0 .. n-1 } k!/(n+k)!. |
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1
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| 0, 2, 8, 504, 1153152, 168275764800, 2407165968578342400, 4788742737385049982623884800, 1780642079411485280163076498360356864000
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