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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.

A128274 Absolute values of numerators of series expansion of cosh(x)/sqrt((cosh(x))^2+(sinh(x))^2) about 0 (even-indexed coefficients only).

Table of values

n a(n)
0 1
1 1
2 17
3 721
4 58337
5 7734241
6 218014151
7 419784870961
8 153563504618177
9 10300599833780983
10 2486497854930863041
11 30262124466958766778001
12 3711710439292601861342231
13 26350476755161831091778460321
14 31166629149666821954776191205937
15 45673109693364177065089340171611

List of values

[1, 1, 17, 721, 58337, 7734241, 218014151, 419784870961, 153563504618177, 10300599833780983, 2486497854930863041, 30262124466958766778001, 3711710439292601861342231, 26350476755161831091778460321, 31166629149666821954776191205937, 45673109693364177065089340171611]

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

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