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 | 5 |
| 2 | 36 |
| 3 | 455 |
| 4 | 12650 |
| 5 | 962598 |
| 6 | 237093780 |
| 7 | 209004408899 |
| 8 | 689960224294614 |
| 9 | 8639439963148103450 |
| 10 | 409865407260324119340236 |
| 11 | 73328394245057556170201283726 |
| 12 | 49287010273876375495535472789937580 |