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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.

A022916 Multinomial coefficient n!/([n/3]![(n+1)/3]![(n+2)/3]!).

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 12
5 30
6 90
7 210
8 560
9 1680
10 4200
11 11550
12 34650
13 90090
14 252252
15 756756
16 2018016
17 5717712
18 17153136
19 46558512
20 133024320
21 399072960
22 1097450640
23 3155170590
24 9465511770
25 26293088250
26 75957810500
27 227873431500
28 638045608200
29 1850332263780
30 5550996791340

List of values

[1, 1, 2, 6, 12, 30, 90, 210, 560, 1680, 4200, 11550, 34650, 90090, 252252, 756756, 2018016, 5717712, 17153136, 46558512, 133024320, 399072960, 1097450640, 3155170590, 9465511770, 26293088250, 75957810500, 227873431500, 638045608200, 1850332263780, 5550996791340]

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

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