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 | 7 |
| 3 | 68 |
| 4 | 279 |
| 5 | 7056 |
| 6 | 7100 |
| 7 | 349200 |
| 8 | 1400175 |
| 9 | 12622400 |
| 10 | 12637296 |
| 11 | 1530446400 |
| 12 | 1531460700 |
| 13 | 258950260800 |
| 14 | 259056111600 |
| 15 | 259141506624 |
| 16 | 1036845584775 |
| 17 | 299715332716800 |
| 18 | 299771444772800 |
| 19 | 108234634597689600 |
| 20 | 108249271042728816 |
| 21 | 108261866776377600 |
| 22 | 108272784263716800 |