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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.

A112019 a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+k,k)^2.

Table of values

n a(n)
0 1
1 5
2 55
3 749
4 11251
5 178835
6 2949115
7 49906925
8 860905315
9 15071939255
10 266982872905
11 4774722189275
12 86070844191775
13 1561948324845095
14 28507384046515555
15 522867506128197869
16 9631571375362268515
17 178094411589895650815
18 3304192479145474141741
19 61487420580006795749999

List of values

[1, 5, 55, 749, 11251, 178835, 2949115, 49906925, 860905315, 15071939255, 266982872905, 4774722189275, 86070844191775, 1561948324845095, 28507384046515555, 522867506128197869, 9631571375362268515, 178094411589895650815, 3304192479145474141741, 61487420580006795749999]

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

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