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 | 9 |
4 | 48 |
5 | 340 |
6 | 2820 |
7 | 27720 |
8 | 309120 |
9 | 3897936 |
10 | 54472320 |
11 | 838918080 |
12 | 14080651200 |
13 | 256214724480 |
14 | 5018771197440 |
15 | 105361754097600 |
16 | 2358985057228800 |
17 | 56124276848640000 |
18 | 1413738138502609920 |
19 | 37591686093776855040 |
20 | 1052149579611011481600 |