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.

A123691 a(n) = number of standard Young tableaux of type (n,n-1,n-1).

Table of values

n a(n)
1 1
2 3
3 21
4 210
5 2574
6 36036
7 554268
8 9145422
9 159352050
10 2900207310
11 54698315490
12 1062710129520
13 21172455657360
14 431010704453400
15 8939669081780520
16 188478023140872630
17 4031562420682009290
18 87350519114776867950
19 1914486941500560677250
20 42397183540866961907100

List of values

[1, 3, 21, 210, 2574, 36036, 554268, 9145422, 159352050, 2900207310, 54698315490, 1062710129520, 21172455657360, 431010704453400, 8939669081780520, 188478023140872630, 4031562420682009290, 87350519114776867950, 1914486941500560677250, 42397183540866961907100]

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

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