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 | 0 |
| 1 | 6 |
| 2 | 2304 |
| 3 | 157464 |
| 4 | 5308416 |
| 5 | 121500000 |
| 6 | 2176782336 |
| 7 | 32934190464 |
| 8 | 440301256704 |
| 9 | 5355700839936 |
| 10 | 60466176000000 |
| 11 | 642717115324416 |
| 12 | 6499837226778624 |
| 13 | 63041475422674944 |
| 14 | 590045794670739456 |
| 15 | 5355700839936000000 |