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) |
---|---|
1 | 1 |
2 | 4 |
3 | 20 |
4 | 120 |
5 | 560 |
6 | 19600 |
7 | 27720 |
8 | 1521520 |
9 | 7207200 |
10 | 2845642800 |
11 | 4170866700 |
12 | 249466897680 |
13 | 9117204216120 |
14 | 1723262134513920 |
15 | 2525472914524560 |
16 | 189169152233901840 |
17 | 1782424363173854400 |
18 | 28708458878287188000 |
19 | 15137401000857582807360 |
20 | 32632841312905676442600 |
21 | 647550654467707884653760 |