References to A001813

Quadruple factorial numbers: (2*n)!/n!.
1, 2, 12, 120, 1680, 30240, 665280, 17297280, 518918400, 17643225600


3 seqfan posts

Tue Aug 31 08:40:53 CEST 2010    [seqfan] Re: Permutation inverse = inversion
Mon Aug 30 12:32:29 CEST 2010    [seqfan] Re: Permutation inverse = inversion
Mon Aug 30 04:35:50 CEST 2010    [seqfan] Permutation inverse = inversion

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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