References to A161126

Triangle read by rows: T(n,k) is the number of involutions of {1,2,...,n} having k descents (n>=1; 0<=k
1, 1, 1, 1, 2, 1, 1, 4, 4, 1, 1, 6, 12, 6, 1, 1, 9, 28, 28, 9, 1, 1, 12, 57, 92, 57, 12, 1, 1, 16


1 seqfan posts

Tue Nov 9 20:02:15 CET 2010    [seqfan] Re: A180388-A180389 pops up in unexpected place (Re: PS: Permutation Ascents )

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