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 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 105 |
| 9 | 4809 |
| 10 | 299593 |
| 11 | 1227264585 |
| 12 | 1231525449 |
| 13 | 1495765593 |
| 14 | 21734674907255625 |
| 15 | 128700665796293199 |
| 16 | 129237637608018639 |