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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 102 |
| 4 | 255359 |
| 5 | 15504309761 |
| 6 | 21955745395591600 |
| 7 | 712319733455900182066337 |
| 8 | 524246290066954425217045809870657 |