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.

A382668 a(n) = C(n+1) - C(n-1) - 2*C(n-2) where C(n) = A000108(n) are the Catalan numbers.

Table of values

n a(n)
2 2
3 10
4 33
5 108
6 359
7 1214
8 4169
9 14508
10 51064
11 181492
12 650522
13 2348856
14 8535921
15 31197430
16 114601065
17 422891340
18 1566903060
19 5827192140
20 21743726430
21 81383916840
22 305465105790
23 1149489049644
24 4335921660522
25 16391329697528
26 62091796219904
27 235656705875304

List of values

[2, 10, 33, 108, 359, 1214, 4169, 14508, 51064, 181492, 650522, 2348856, 8535921, 31197430, 114601065, 422891340, 1566903060, 5827192140, 21743726430, 81383916840, 305465105790, 1149489049644, 4335921660522, 16391329697528, 62091796219904, 235656705875304]

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

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