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A091496
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a(n) = ((5n)!/(n!(2n)!))(gamma(1+n/2)/gamma(1+5n/2)).
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0
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1, 16, 630, 28672, 1385670, 69206016, 3528923580, 182536110080, 9540949030470, 502682972323840, 26651569523959380, 1420217179365703680, 75998432812419471900, 4081125953526124511232, 219813190240007470094520
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