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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.

A009013 Expansion of E.g.f.: 1/(cosh(x)*cos(x)) (only powers that are multiples of 4).

Table of values

n a(n)
0 1
1 4
2 1104
3 2154304
4 15456463104
5 295213107733504
6 12366226074019221504
7 998143138923599406383104
8 141496025961835234723147874304
9 32857017298796399667445911477551104
10 11837460622615877064781409516336792469504

List of values

[1, 4, 1104, 2154304, 15456463104, 295213107733504, 12366226074019221504, 998143138923599406383104, 141496025961835234723147874304, 32857017298796399667445911477551104, 11837460622615877064781409516336792469504]

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

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