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 | 3 |
4 | 20 |
5 | 150 |
6 | 1254 |
7 | 14280 |
8 | 190000 |
9 | 2863728 |
10 | 49465080 |
11 | 954312480 |
12 | 20303200488 |
13 | 473604468480 |
14 | 12007399511184 |
15 | 328671680500800 |
16 | 9663415159357440 |
17 | 303695188102656000 |
18 | 10159173955921651776 |
19 | 360424299614544829440 |
20 | 13517056067747847719040 |