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.
n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 84 |
5 | 840 |
6 | 14160 |
7 | 246960 |
8 | 5438160 |
9 | 132209280 |
10 | 3696265440 |
11 | 114042297600 |
12 | 3898083752640 |
13 | 145315002792960 |
14 | 5886559994515200 |
15 | 257081021880883200 |
16 | 12051082491262214400 |
17 | 603307920100773888000 |
18 | 32132914081702520486400 |
19 | 1814085935013542141952000 |
20 | 108218538908648830498636800 |