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 | 8 |
| 2 | 45 |
| 3 | 220 |
| 4 | 1001 |
| 5 | 4368 |
| 6 | 18565 |
| 7 | 77540 |
| 8 | 320001 |
| 9 | 1309528 |
| 10 | 5326685 |
| 11 | 21572460 |
| 12 | 87087001 |
| 13 | 350739488 |
| 14 | 1410132405 |
| 15 | 5662052980 |
| 16 | 22712782001 |
| 17 | 91044838248 |
| 18 | 364760483725 |
| 19 | 1460785327100 |
| 20 | 5848371485001 |
| 21 | 23409176469808 |
| 22 | 93683777468645 |
| 23 | 374876324642820 |
| 24 | 1499928942876001 |