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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.

A383120 a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n*k,k).

Table of values

n a(n)
0 1
1 2
2 11
3 139
4 2885
5 82381
6 2979565
7 130203494
8 6664589321
9 390857822425
10 25832193906761
11 1899273577364197
12 153741850998047053
13 13585520026454056279
14 1301210398133681268381
15 134270617908678099820891
16 14849785991790603714043921
17 1752283118795349858851381297

List of values

[1, 2, 11, 139, 2885, 82381, 2979565, 130203494, 6664589321, 390857822425, 25832193906761, 1899273577364197, 153741850998047053, 13585520026454056279, 1301210398133681268381, 134270617908678099820891, 14849785991790603714043921, 1752283118795349858851381297]

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

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