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 | 3 |
| 2 | 126 |
| 3 | 66708 |
| 4 | 379033074 |
| 5 | 21399656315607 |
| 6 | 11566324342205917416 |
| 7 | 58678275719834357303044728 |
| 8 | 2762222169999029718435709903699050 |
| 9 | 1197781369953334546750963984948238943438411 |