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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 22 |
| 6 | 81 |
| 7 | 331 |
| 8 | 1435 |
| 9 | 6505 |
| 10 | 30086 |
| 11 | 141229 |
| 12 | 669584 |
| 13 | 3198256 |
| 14 | 15367577 |
| 15 | 74207910 |
| 16 | 359863778 |
| 17 | 1751594643 |
| 18 | 8553649747 |
| 19 | 41892642772 |
| 20 | 205714411986 |
| 21 | 1012565172403 |
| 22 | 4994807695197 |
| 23 | 24687124900540 |
| 24 | 122238208783203 |