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.

A185020 a(n) = A000108(n)*A002605(n+1), where A000108 are the Catalan numbers.

Table of values

n a(n)
0 1
1 2
2 12
3 80
4 616
5 5040
6 43296
7 384384
8 3500640
9 32517056
10 306896512
11 2934597120
12 28369508608
13 276810483200
14 2722537128960
15 26963147796480
16 268659456837120
17 2691301381401600
18 27089160416102400
19 273833161582632960
20 2778754123765002240
21 28296326851107594240

List of values

[1, 2, 12, 80, 616, 5040, 43296, 384384, 3500640, 32517056, 306896512, 2934597120, 28369508608, 276810483200, 2722537128960, 26963147796480, 268659456837120, 2691301381401600, 27089160416102400, 273833161582632960, 2778754123765002240, 28296326851107594240]

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

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