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 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 76 |
| 5 | 539 |
| 6 | 8873 |
| 7 | 505531 |
| 8 | 173789117 |
| 9 | 801854912659 |
| 10 | 157566761299009378 |
| 11 | 6992370157470308367564294 |
| 12 | 780243941119853800883766562690845097 |
| 13 | 7117897437316498836240639309909700742341112693648555 |