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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.

A249698 E.g.f.: Sum_{n>=0} Product_{k=1..n} cosh(k*x).

Table of values

n a(n)
0 1
1 0
2 6
3 0
4 2426
5 0
6 7553776
7 0
8 90192976308
9 0
10 2939813898295990
11 0
12 213701821328573755046
13 0
14 30292525174041077292043440
15 0
16 7609302838629919155170452856136
17 0
18 3152886110080180503361685427596189430
19 0
20 2038143533263759863560759054752335955960482

List of values

[1, 0, 6, 0, 2426, 0, 7553776, 0, 90192976308, 0, 2939813898295990, 0, 213701821328573755046, 0, 30292525174041077292043440, 0, 7609302838629919155170452856136, 0, 3152886110080180503361685427596189430, 0, 2038143533263759863560759054752335955960482]

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

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