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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.

A228808 a(n) = Sum_{k=0..n} binomial(n*k, k^2).

Table of values

n a(n)
0 1
1 2
2 4
3 20
4 296
5 10067
6 927100
7 219541877
8 110728186648
9 137502766579907
10 448577320868198789
11 3169529341990169816462
12 51243646781214826181569316
13 2201837465728010770618930322223
14 215520476721579201896200887266792583
15 45634827026091489574547858030506357191920

List of values

[1, 2, 4, 20, 296, 10067, 927100, 219541877, 110728186648, 137502766579907, 448577320868198789, 3169529341990169816462, 51243646781214826181569316, 2201837465728010770618930322223, 215520476721579201896200887266792583, 45634827026091489574547858030506357191920]

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

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