a(n) = 5*2^(n-1)-2-3*n.
0, 2, 9, 26, 63, 140, 297, 614, 1251, 2528, 5085, 10202, 20439, 40916, 81873
3 seqfan posts
Wed Jun 27 11:46:36 CEST 2012 [seqfan] Re: A087035 (convolution of permutations) and A213387 (count of triples)
Tue Jun 26 18:14:55 CEST 2012 [seqfan] Re: A087035 (convolution of permutations) and A213387 (count of triples)
Tue Jun 26 15:32:56 CEST 2012 [seqfan] A087035 (convolution of permutations) and A213387 (count of triples)
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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