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 | 1 |
| 3 | 5 |
| 4 | 210 |
| 5 | 162482 |
| 6 | 3431771334 |
| 7 | 2675532842827606 |
| 8 | 98099380263646542332472 |
| 9 | 207159998877655913898903666460600 |
| 10 | 29992398464230524512087152790819658487446680 |