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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.

A295871 a(n) = numerator(hypergeom([-n, 1/2], [1], 1)*hypergeom([-floor(n/2), (-1)^n/2], [1], 1)).

Table of values

n a(n)
0 1
1 1
2 3
3 15
4 105
5 945
6 1155
7 15015
8 225225
9 3828825
10 2909907
11 61108047
12 156165009
13 3904125225
14 2151252675
15 62386327575
16 1933976154825
17 63821213109225
18 27577067392875
19 1020351493536375
20 1591748329916745
21 65261681526586545
22 23192167815233235
23 1043647551685495575

List of values

[1, 1, 3, 15, 105, 945, 1155, 15015, 225225, 3828825, 2909907, 61108047, 156165009, 3904125225, 2151252675, 62386327575, 1933976154825, 63821213109225, 27577067392875, 1020351493536375, 1591748329916745, 65261681526586545, 23192167815233235, 1043647551685495575]

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

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