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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.

A358436 a(n) = Sum_{j=0..n} C(n)*C(n-j), where C(n) is the n-th Catalan number.

Table of values

n a(n)
0 1
1 2
2 8
3 45
4 322
5 2730
6 26004
7 268554
8 2940080
9 33635316
10 398300344
11 4849845000
12 60429982144
13 767721774800
14 9916427702880
15 129937069996965
16 1724052965464890
17 23129299114182030
18 313351935000465900
19 4282621342230699930
20 58994556159403576140
21 818487022124443918740

List of values

[1, 2, 8, 45, 322, 2730, 26004, 268554, 2940080, 33635316, 398300344, 4849845000, 60429982144, 767721774800, 9916427702880, 129937069996965, 1724052965464890, 23129299114182030, 313351935000465900, 4282621342230699930, 58994556159403576140, 818487022124443918740]

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

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