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 | 17 |
| 3 | 241 |
| 4 | 3361 |
| 5 | 46817 |
| 6 | 652081 |
| 7 | 9082321 |
| 8 | 126500417 |
| 9 | 1761923521 |
| 10 | 24540428881 |
| 11 | 341804080817 |
| 12 | 4760716702561 |
| 13 | 66308229755041 |
| 14 | 923554499868017 |
| 15 | 12863454768397201 |
| 16 | 179164812257692801 |
| 17 | 2495443916839302017 |
| 18 | 34757050023492535441 |
| 19 | 484103256412056194161 |