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 | 0 |
3 | 6 |
4 | 12 |
5 | 40 |
6 | 1620 |
7 | 13608 |
8 | 117600 |
9 | 2924640 |
10 | 49603680 |
11 | 782147520 |
12 | 19083936960 |
13 | 463369645440 |
14 | 10836652514688 |
15 | 304533583200000 |
16 | 9218842256332800 |
17 | 281872333420554240 |
18 | 9421579421176089600 |
19 | 338543319734116116480 |
20 | 12590519274541116518400 |