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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.

A349265 Generalized Euler numbers, a(n) = n!*[x^n](sec(5*x)*(sin(x) + sin(3*x) + cos(2*x) + cos(4*x))).

Table of values

n a(n)
0 2
1 4
2 30
3 272
4 3522
5 55744
6 1066590
7 23750912
8 604935042
9 17328937984
10 551609685150
11 19313964388352
12 737740947722562
13 30527905292468224
14 1360427147514751710
15 64955605537174126592
16 3308161927353377294082
17 179013508069217017790464
18 10256718523496425979562270

List of values

[2, 4, 30, 272, 3522, 55744, 1066590, 23750912, 604935042, 17328937984, 551609685150, 19313964388352, 737740947722562, 30527905292468224, 1360427147514751710, 64955605537174126592, 3308161927353377294082, 179013508069217017790464, 10256718523496425979562270]

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

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