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 | 60 |
| 2 | 1584 |
| 3 | 27456 |
| 4 | 366080 |
| 5 | 4073472 |
| 6 | 39690240 |
| 7 | 349274112 |
| 8 | 2835283968 |
| 9 | 21554790400 |
| 10 | 155194490880 |
| 11 | 1067345510400 |
| 12 | 7058711642112 |
| 13 | 45127489814528 |
| 14 | 280101660917760 |
| 15 | 1693862087098368 |
| 16 | 10009185060126720 |
| 17 | 57935518230380544 |