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 | 2 |
| 2 | 12 |
| 3 | 44 |
| 4 | 84 |
| 5 | 68 |
| 6 | 14328 |
| 7 | 836 |
| 8 | 24040 |
| 9 | 1231088 |
| 10 | 31063252 |
| 11 | 5495668 |
| 12 | 2474249308 |
| 13 | 4505692 |
| 14 | 130544952 |
| 15 | 2741953536 |
| 16 | 6519198872 |
| 17 | 11977808 |
| 18 | 2197436928400 |
| 19 | 5058240848 |
| 20 | 11783977054420 |
| 21 | 363453226568756 |
| 22 | 135517101268864 |
| 23 | 6345558675936 |
| 24 | 67883449330825012 |
| 25 | 1419845303575428 |