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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.

A295257 Expansion of e.g.f. cot(x)*(1 - sqrt(1 - 4*tan(x)))/2.

Table of values

n a(n)
0 1
1 1
2 4
3 32
4 368
5 5656
6 109024
7 2533712
8 68995328
9 2155513216
10 76014982144
11 2987332904192
12 129473128921088
13 6135478762187776
14 315609465774936064
15 17515027337549545472
16 1043104219010147483648
17 66358462250378681614336
18 4491141928841064201846784
19 322219449242531127348887552

List of values

[1, 1, 4, 32, 368, 5656, 109024, 2533712, 68995328, 2155513216, 76014982144, 2987332904192, 129473128921088, 6135478762187776, 315609465774936064, 17515027337549545472, 1043104219010147483648, 66358462250378681614336, 4491141928841064201846784, 322219449242531127348887552]

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

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