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 | 2 |
2 | 6 |
3 | 40 |
4 | 210 |
5 | 2016 |
6 | 13860 |
7 | 164736 |
8 | 1351350 |
9 | 18670080 |
10 | 174594420 |
11 | 2708858880 |
12 | 28109701620 |
13 | 479259648000 |
14 | 5421156741000 |
15 | 100069414502400 |
16 | 1218404977539750 |
17 | 24087296714342400 |
18 | 312723944235202500 |
19 | 6566957735804928000 |
20 | 90252130306279441500 |
21 | 2000107698962300928000 |