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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.

A147291 a(n) = Sum_{k=1..n^2-1} binomial(2k,k).

Table of values

n a(n)
1 0
2 28
3 17576
4 209295260
5 43308802158650
6 150315393336149895056
7 8610524734277600186228691452
8 8068213695203463278728832778415607708
9 122985780058082302876789680971972469134558550878
10 30386103720799858392019761983012781659021124133753353112778

List of values

[0, 28, 17576, 209295260, 43308802158650, 150315393336149895056, 8610524734277600186228691452, 8068213695203463278728832778415607708, 122985780058082302876789680971972469134558550878, 30386103720799858392019761983012781659021124133753353112778]

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

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