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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.

A082787 a(n) = (2/3)*(2*n-1)!*binomial(3*n,2*n).

Table of values

n a(n)
1 2
2 60
3 6720
4 1663200
5 726485760
6 494010316800
7 482718652416000
8 641171050071552000
9 1111363153457356800000
10 2436552577639909048320000
11 6591982246414881207091200000
12 21572261901392698750205952000000
13 83992431415453295380032651264000000
14 383725422380885198036206312488960000000

List of values

[2, 60, 6720, 1663200, 726485760, 494010316800, 482718652416000, 641171050071552000, 1111363153457356800000, 2436552577639909048320000, 6591982246414881207091200000, 21572261901392698750205952000000, 83992431415453295380032651264000000, 383725422380885198036206312488960000000]

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

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