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 | 35 |
| 2 | 840 |
| 3 | 17640 |
| 4 | 352800 |
| 5 | 6985440 |
| 6 | 139708800 |
| 7 | 2854051200 |
| 8 | 59935075200 |
| 9 | 1298593296000 |
| 10 | 29088489830400 |
| 11 | 674324082432000 |
| 12 | 16183777978368000 |
| 13 | 402104637462528000 |
| 14 | 10339833534750720000 |
| 15 | 275039572024369152000 |