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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.

A024486 a(n) = (1/(2n+1))*Multinomial(3n; n,n,n).

Table of values

n a(n)
0 1
1 2
2 18
3 240
4 3850
5 68796
6 1319472
7 26604864
8 556794810
9 11993338500
10 264333180540
11 5935956324480
12 135389270500848
13 3128818447143200
14 73123195376232000
15 1725644509205633280
16 41071074678970154010
17 984853105623747983700
18 23773506148264947574500

List of values

[1, 2, 18, 240, 3850, 68796, 1319472, 26604864, 556794810, 11993338500, 264333180540, 5935956324480, 135389270500848, 3128818447143200, 73123195376232000, 1725644509205633280, 41071074678970154010, 984853105623747983700, 23773506148264947574500]

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

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