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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.

A009805 Expansion of e.g.f. tanh(sinh(x)*sin(x))/2 in odd powers of x^2.

Table of values

n a(n)
0 1
1 -124
2 262096
3 -2681078464
4 83993259325696
5 -6291889632188161024
6 963296773204704677810176
7 -270352239123704851078462357504
8 128399592149905444543967414059073536
9 -97061880731293117665388947647693059784704
10 111259126741155511631646423576320132328299954176

List of values

[1, -124, 262096, -2681078464, 83993259325696, -6291889632188161024, 963296773204704677810176, -270352239123704851078462357504, 128399592149905444543967414059073536, -97061880731293117665388947647693059784704, 111259126741155511631646423576320132328299954176]

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

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