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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.

A129256 Central coefficient of Product_{k=0..n} (1+k*x)^2.

Table of values

n a(n)
0 1
1 2
2 13
3 144
4 2273
5 46710
6 1184153
7 35733376
8 1251320145
9 49893169050
10 2232012515445
11 110722046632560
12 6032418472347265
13 358103844593876654
14 23007314730623658225
15 1590611390957425536000
16 117745011140615270168865

List of values

[1, 2, 13, 144, 2273, 46710, 1184153, 35733376, 1251320145, 49893169050, 2232012515445, 110722046632560, 6032418472347265, 358103844593876654, 23007314730623658225, 1590611390957425536000, 117745011140615270168865]

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

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