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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 29 |
| 6 | 135 |
| 7 | 775 |
| 8 | 5302 |
| 9 | 41841 |
| 10 | 373349 |
| 11 | 3711707 |
| 12 | 40658196 |
| 13 | 486383173 |
| 14 | 6307963843 |
| 15 | 88147345839 |
| 16 | 1320249637490 |
| 17 | 21098598196505 |
| 18 | 358321619407137 |
| 19 | 6444482754775171 |
| 20 | 122360423398008784 |
| 21 | 2445769875087993837 |