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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A326995 a(n) = A002105(n+1) - A005046(n), reduced tangent numbers minus the number of partitions of a 2*n-set into even blocks.

Table of values

n a(n)
0 0
1 0
2 0
3 3
4 117
5 4500
6 199155
7 10499643
8 663488532
9 50115742365
10 4497657826905
11 476074241776188
12 58963860817626567
13 8475738174076417335
14 1402598717609785850700
15 265126817539686778513113
16 56822367893441673215117997
17 13712983199783483607459996660
18 3702793973661590950848375537915

List of values

[0, 0, 0, 3, 117, 4500, 199155, 10499643, 663488532, 50115742365, 4497657826905, 476074241776188, 58963860817626567, 8475738174076417335, 1402598717609785850700, 265126817539686778513113, 56822367893441673215117997, 13712983199783483607459996660, 3702793973661590950848375537915]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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