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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.

A060542 a(n) = (1/6)*multinomial(3*n;n,n,n).

Table of values

n a(n)
1 1
2 15
3 280
4 5775
5 126126
6 2858856
7 66512160
8 1577585295
9 37978905250
10 925166131890
11 22754499243840
12 564121960420200
13 14079683012144400
14 353428777651788000
15 8915829964229105280
16 225890910734335847055
17 5744976449471863238250
18 146603287914300510042750

List of values

[1, 15, 280, 5775, 126126, 2858856, 66512160, 1577585295, 37978905250, 925166131890, 22754499243840, 564121960420200, 14079683012144400, 353428777651788000, 8915829964229105280, 225890910734335847055, 5744976449471863238250, 146603287914300510042750]

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

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