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 | 1 |
| 2 | 2 |
| 3 | 28 |
| 4 | 1504 |
| 5 | 520176 |
| 6 | 696179102 |
| 7 | 5373177281748 |
| 8 | 166903679914150336 |
| 9 | 28636599794306124116062 |
| 10 | 20262965974179958448766775754 |