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 | 48 |
| 2 | 1296 |
| 3 | 25920 |
| 4 | 427680 |
| 5 | 6158592 |
| 6 | 80061696 |
| 7 | 960740352 |
| 8 | 10808328960 |
| 9 | 115288842240 |
| 10 | 1175946190848 |
| 11 | 11545653510144 |
| 12 | 109683708346368 |
| 13 | 1012465000120320 |
| 14 | 9112185001082880 |
| 15 | 80187228009529344 |
| 16 | 691614841582190592 |
| 17 | 5858384540460908544 |
| 18 | 48819871170507571200 |
| 19 | 400836836978904268800 |