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 | 5 |
| 3 | 63 |
| 4 | 429 |
| 5 | 12155 |
| 6 | 88179 |
| 7 | 1300075 |
| 8 | 9694845 |
| 9 | 583401555 |
| 10 | 4418157975 |
| 11 | 67282234305 |
| 12 | 514589420475 |
| 13 | 15801325804719 |
| 14 | 121683714103007 |
| 15 | 1879204156221315 |
| 16 | 14544636039226909 |
| 17 | 1804857108504066435 |