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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.

A360082 a(n) = Sum_{k=0..n} binomial(4*k,n-k) * Catalan(k).

Table of values

n a(n)
0 1
1 1
2 6
3 27
4 134
5 709
6 3892
7 22004
8 127250
9 749230
10 4476386
11 27071344
12 165398868
13 1019405720
14 6330482488
15 39571612357
16 248796862550
17 1572300095758
18 9981970108384
19 63633339713190
20 407162295120570
21 2614059813642256
22 16834457481559076

List of values

[1, 1, 6, 27, 134, 709, 3892, 22004, 127250, 749230, 4476386, 27071344, 165398868, 1019405720, 6330482488, 39571612357, 248796862550, 1572300095758, 9981970108384, 63633339713190, 407162295120570, 2614059813642256, 16834457481559076]

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

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