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Search: id:A000515
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| A000515 |
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(2n)!(2n+1)!/n!^4, or equally (2n+1)C(2n,n)^2.
(Formerly M4874 N2087)
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5
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| 1, 12, 180, 2800, 44100, 698544, 11099088, 176679360, 2815827300, 44914183600, 716830370256, 11445589052352, 182811491808400, 2920656969720000, 46670906271240000, 745904795339462400
(list; graph; listen)
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