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.

A220902 a(n) = Catalan(n) - A000245(n-2).

Table of values

n a(n)
2 2
3 4
4 11
5 33
6 104
7 339
8 1133
9 3861
10 13364
11 46852
12 166022
13 593674
14 2139552
15 7763305
16 28337265
17 103981965
18 383351580
19 1419269280
20 5274495930
21 19669409790
22 73580417040
23 276043317030
24 1038327097314
25 3915101867778
26 14795310818024
27 56028144245304
28 212581753906508
29 808027815817012

List of values

[2, 4, 11, 33, 104, 339, 1133, 3861, 13364, 46852, 166022, 593674, 2139552, 7763305, 28337265, 103981965, 383351580, 1419269280, 5274495930, 19669409790, 73580417040, 276043317030, 1038327097314, 3915101867778, 14795310818024, 56028144245304, 212581753906508, 808027815817012]

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

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