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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 5 |
| 7 | 4 |
| 8 | 17 |
| 9 | 22 |
| 10 | 167 |
| 11 | 539 |
| 12 | 18979 |
| 13 | 389436 |
| 14 | 50314796 |
| 15 | 2942198440 |
| 16 | 1698517036411 |
| 17 | 442786966115560 |
| 18 | 649978211591600286 |
| 19 | 429712868499646474880 |
| 20 | 2886054228478618211088773 |
| 21 | 8835589045148342277771518309 |
| 22 | 152929279364927228928021274993215 |
| 23 | 1207932509391069805495173301992815105 |
| 24 | 99162609848561525198669168640159162918815 |