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 | 2 |
| 2 | 9 |
| 3 | 71 |
| 4 | 800 |
| 5 | 11659 |
| 6 | 208173 |
| 7 | 4398148 |
| 8 | 107293711 |
| 9 | 2967800711 |
| 10 | 91777098006 |
| 11 | 3137581240925 |
| 12 | 117499040544197 |
| 13 | 4783424590188490 |
| 14 | 210333509575901445 |
| 15 | 9934472399437068811 |
| 16 | 501615620424564184408 |
| 17 | 26963169913347131361647 |