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 | 2 |
| 3 | 2 |
| 4 | 4 |
| 5 | 3 |
| 6 | 8 |
| 7 | 6 |
| 8 | 22 |
| 9 | 26 |
| 10 | 176 |
| 11 | 546 |
| 12 | 19002 |
| 13 | 389454 |
| 14 | 50314870 |
| 15 | 2942198546 |
| 16 | 1698517037030 |
| 17 | 442786966117636 |
| 18 | 649978211591622812 |
| 19 | 429712868499646587714 |
| 20 | 2886054228478618215888598 |
| 21 | 8835589045148342277802657274 |
| 22 | 152929279364927228928025482936226 |
| 23 | 1207932509391069805495173417972533120 |
| 24 | 99162609848561525198669168653641835566774 |