cp's OEIS Frontend

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.

A342288 a(n) = C(n)*C(n+2), where C(n) is the n-th Catalan number A000108(n).

Table of values

n a(n)
0 2
1 5
2 28
3 210
4 1848
5 18018
6 188760
7 2085798
8 24018280
9 285817532
10 3493769552
11 43672119400
12 556315613280
13 7202300350500
14 94561966954800
15 1256886144107550
16 16888191533829000
17 229116465142280100
18 3135277944052254000
19 43238333101156993800
20 600502564063273528800

List of values

[2, 5, 28, 210, 1848, 18018, 188760, 2085798, 24018280, 285817532, 3493769552, 43672119400, 556315613280, 7202300350500, 94561966954800, 1256886144107550, 16888191533829000, 229116465142280100, 3135277944052254000, 43238333101156993800, 600502564063273528800]

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

Content is available under The OEIS End-User License Agreement.