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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.

A335643 Expansion of e.g.f. Product_{k>0} 1/(1 - tan(x)^k / k!).

Table of values

n a(n)
0 1
1 1
2 3
3 12
4 71
5 462
6 3890
7 35133
8 381583
9 4411870
10 58623990
11 826335675
12 12990713482
13 216027857567
14 3925135187017
15 75217607162053
16 1552186877466271
17 33678081631793270
18 778592124168964502
19 18867293553102673343
20 483291402186818709310
21 12937553749692179771301
22 363847628395565829224327

List of values

[1, 1, 3, 12, 71, 462, 3890, 35133, 381583, 4411870, 58623990, 826335675, 12990713482, 216027857567, 3925135187017, 75217607162053, 1552186877466271, 33678081631793270, 778592124168964502, 18867293553102673343, 483291402186818709310, 12937553749692179771301, 363847628395565829224327]

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

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