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) |
|---|---|
| 7 | 120 |
| 8 | 4320 |
| 9 | 83628 |
| 10 | 1169768 |
| 11 | 13329084 |
| 12 | 131888624 |
| 13 | 1178097904 |
| 14 | 9745456704 |
| 15 | 75988344096 |
| 16 | 565644812320 |
| 17 | 4057808611860 |
| 18 | 28255332957880 |
| 19 | 192032572801508 |
| 20 | 1279389256340592 |
| 21 | 8384651931678936 |
| 22 | 54203683325174736 |