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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.

A349264 Generalized Euler numbers, a(n) = n!*[x^n](sec(4*x)*(sin(4*x) + 1)).

Table of values

n a(n)
0 1
1 4
2 16
3 128
4 1280
5 16384
6 249856
7 4456448
8 90767360
9 2080374784
10 52975108096
11 1483911200768
12 45344872202240
13 1501108249821184
14 53515555843342336
15 2044143848640217088
16 83285910482761809920
17 3605459138582973251584
18 165262072909347030040576
19 7995891855149741436305408

List of values

[1, 4, 16, 128, 1280, 16384, 249856, 4456448, 90767360, 2080374784, 52975108096, 1483911200768, 45344872202240, 1501108249821184, 53515555843342336, 2044143848640217088, 83285910482761809920, 3605459138582973251584, 165262072909347030040576, 7995891855149741436305408]

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

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