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 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 18 |
5 | 255 |
6 | 3555 |
7 | 52290 |
8 | 831684 |
9 | 14405580 |
10 | 271688580 |
11 | 5562400800 |
12 | 123123764808 |
13 | 2933953637472 |
14 | 74953425290016 |
15 | 2044855241694720 |
16 | 59361121229581440 |
17 | 1827578437315965696 |
18 | 59494057195888597248 |
19 | 2042194772007257103360 |
20 | 73731225467600254686720 |