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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.

A360103 a(n) = Sum_{k=0..n} binomial(n+4*k,n-k) * Catalan(k).

Table of values

n a(n)
0 1
1 2
2 9
3 49
4 283
5 1715
6 10793
7 69906
8 463031
9 3122264
10 21363065
11 147951489
12 1035173405
13 7306326465
14 51959150713
15 371950057003
16 2678083379707
17 19381867703946
18 140915907625531
19 1028760981192771
20 7538511404971231
21 55427326349613665
22 408789584900354397

List of values

[1, 2, 9, 49, 283, 1715, 10793, 69906, 463031, 3122264, 21363065, 147951489, 1035173405, 7306326465, 51959150713, 371950057003, 2678083379707, 19381867703946, 140915907625531, 1028760981192771, 7538511404971231, 55427326349613665, 408789584900354397]

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

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