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.

A222052 a(n) = A222051(n)/binomial(2*n,n), the central terms in rows of triangle A220178 divided by the central binomial coefficients.

Table of values

n a(n)
0 1
1 3
2 25
3 210
4 1881
5 17303
6 162214
7 1540710
8 14776281
9 142774455
10 1387743525
11 13553773500
12 132906406950
13 1307654814222
14 12902933709922
15 127632756058610
16 1265251299930585
17 12566655467547195
18 125025126985317013
19 1245750306517239978
20 12429515281592007781

List of values

[1, 3, 25, 210, 1881, 17303, 162214, 1540710, 14776281, 142774455, 1387743525, 13553773500, 132906406950, 1307654814222, 12902933709922, 127632756058610, 1265251299930585, 12566655467547195, 125025126985317013, 1245750306517239978, 12429515281592007781]

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

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