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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.

A081442 Expansion of e.g.f.: cosh(x/sqrt(1-x^2)) (even powers).

Table of values

n a(n)
0 1
1 1
2 13
3 421
4 25369
5 2449801
6 346065061
7 67243537453
8 17192488230961
9 5593309059948049
10 2255588021494237501
11 1103994926592923677621
12 644587811150505183179593
13 442516027690815793746696601

List of values

[1, 1, 13, 421, 25369, 2449801, 346065061, 67243537453, 17192488230961, 5593309059948049, 2255588021494237501, 1103994926592923677621, 644587811150505183179593, 442516027690815793746696601]

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

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