C(2n+1,n-3).
1, 9, 55, 286, 1365, 6188, 27132, 116280, 490314, 2042975, 8436285, 34597290
1 seqfan posts
Thu Feb 12 12:14:04 CET 2009 [seqfan] Sequence to A141530
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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