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 | 3 |
| 4 | 13 |
| 5 | 90 |
| 6 | 726 |
| 7 | 7089 |
| 8 | 78369 |
| 9 | 973404 |
| 10 | 13377156 |
| 11 | 201443165 |
| 12 | 3297443264 |
| 13 | 58304208767 |
| 14 | 1107693755122 |