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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 29 |
| 4 | 165 |
| 5 | 593 |
| 6 | 2773 |
| 7 | 11093 |
| 8 | 48605 |
| 9 | 201829 |
| 10 | 864901 |
| 11 | 3638261 |
| 12 | 15472261 |
| 13 | 65377669 |
| 14 | 277294885 |
| 15 | 1173523013 |
| 16 | 4972873413 |
| 17 | 21056700293 |
| 18 | 89200845765 |
| 19 | 377774394309 |
| 20 | 1600161267781 |
| 21 | 6777276186821 |
| 22 | 28705824305861 |
| 23 | 121582507360709 |