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.

A248707 a(n) = f(3*n)/(f(n-1)*f(n)*f(n+1)), where f(k) = k!.

Table of values

n a(n)
1 3
2 60
3 1260
4 27720
5 630630
6 14702688
7 349188840
8 8413788240
9 205086088350
10 5046360719400
11 125149745841120
12 3124367780788800
13 78443948210518800
14 1979201154850012800
15 50151543548788717200
16 1275619260617425959840
17 32554866547007225016750
18 833323952354971320243000

List of values

[3, 60, 1260, 27720, 630630, 14702688, 349188840, 8413788240, 205086088350, 5046360719400, 125149745841120, 3124367780788800, 78443948210518800, 1979201154850012800, 50151543548788717200, 1275619260617425959840, 32554866547007225016750, 833323952354971320243000]