References to A000261

a(n) = n*a(n-1) + (n-3)*a(n-2).
0, 1, 3, 13, 71, 465, 3539, 30637, 296967, 3184129, 37401155, 477471021

1 seqfan posts

Fri Oct 29 05:35:16 CEST 2010    [seqfan] Implementing first 500 sequences in Java
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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