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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.

A337292 a(n) = 4*binomial(5*n,n)/(5*n-1).

Table of values

n a(n)
1 5
2 20
3 130
4 1020
5 8855
6 81900
7 791120
8 7887660
9 80560285
10 838553320
11 8863227100
12 94871786100
13 1026317094705
14 11203116342560
15 123243929011680
16 1364973221797900
17 15207477517956825
18 170321264840835900
19 1916512328325665070
20 21655893753689280120

List of values

[5, 20, 130, 1020, 8855, 81900, 791120, 7887660, 80560285, 838553320, 8863227100, 94871786100, 1026317094705, 11203116342560, 123243929011680, 1364973221797900, 15207477517956825, 170321264840835900, 1916512328325665070, 21655893753689280120]

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

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