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 | 40 |
5 | 280 |
6 | 2496 |
7 | 25424 |
8 | 297984 |
9 | 3920256 |
10 | 57349120 |
11 | 922611712 |
12 | 16193375232 |
13 | 307896882176 |
14 | 6304666798080 |
15 | 138318662000640 |
16 | 3236895083167744 |
17 | 80483201605795840 |
18 | 2118875812456366080 |
19 | 58882581280649117696 |
20 | 1722441885524719042560 |