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.

A006480 De Bruijn's S(3,n): (3n)!/(n!)^3.

Table of values

n a(n)
0 1
1 6
2 90
3 1680
4 34650
5 756756
6 17153136
7 399072960
8 9465511770
9 227873431500
10 5550996791340
11 136526995463040
12 3384731762521200
13 84478098072866400
14 2120572665910728000
15 53494979785374631680
16 1355345464406015082330
17 34469858696831179429500
18 879619727485803060256500
19 22514366432046593564460000

List of values

[1, 6, 90, 1680, 34650, 756756, 17153136, 399072960, 9465511770, 227873431500, 5550996791340, 136526995463040, 3384731762521200, 84478098072866400, 2120572665910728000, 53494979785374631680, 1355345464406015082330, 34469858696831179429500, 879619727485803060256500, 22514366432046593564460000]