References to A000487

Number of permutations of length n with exactly two valleys.
16, 272, 2880, 24576, 185856, 1304832, 8728576, 56520704, 357888000

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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