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 | -1 |
2 | 2 |
3 | 0 |
4 | 72 |
5 | 1560 |
6 | 59760 |
7 | 2983680 |
8 | 194382720 |
9 | 15959099520 |
10 | 1613411654400 |
11 | 196978231296000 |
12 | 28577836603008000 |
13 | 4860382977536486400 |
14 | 957836230033255372800 |
15 | 216533832180149772288000 |
16 | 55662541733368168574976000 |
17 | 16145371763295690081374208000 |