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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.

A331610 Expansion of e.g.f.: exp(1 / (1 - tan(x)) - 1).

Table of values

n a(n)
0 1
1 1
2 3
3 15
4 97
5 777
6 7379
7 80983
8 1007137
9 13986289
10 214383171
11 3593224767
12 65347120705
13 1281151315641
14 26928292883795
15 603928982033863
16 14392387319349697
17 363135896514611041
18 9669298448057196291
19 270932711729869233903
20 7967970654277850949025

List of values

[1, 1, 3, 15, 97, 777, 7379, 80983, 1007137, 13986289, 214383171, 3593224767, 65347120705, 1281151315641, 26928292883795, 603928982033863, 14392387319349697, 363135896514611041, 9669298448057196291, 270932711729869233903, 7967970654277850949025]

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

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