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 | 3 |
| 3 | 86 |
| 4 | 31302 |
| 5 | 2146841520 |
| 6 | 9223371978880250448 |
| 7 | 170141183460469231408869283342774399392 |
| 8 | 57896044618658097711785492504343953919148780260559635830120038252613826101856 |