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 | 8 |
| 4 | 43 |
| 5 | 289 |
| 6 | 2324 |
| 7 | 21728 |
| 8 | 231357 |
| 9 | 2762593 |
| 10 | 36548198 |
| 11 | 530521688 |
| 12 | 8381982711 |
| 13 | 143178565569 |
| 14 | 2629132373736 |
| 15 | 51642704174656 |
| 16 | 1080444526772505 |
| 17 | 23985750533829185 |
| 18 | 563129733452254922 |
| 19 | 13940268462137558888 |