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 | 2 |
| 3 | 12 |
| 4 | 192 |
| 5 | 8160 |
| 6 | 898560 |
| 7 | 245145600 |
| 8 | 159035627520 |
| 9 | 237882053283840 |
| 10 | 802369403419852800 |
| 11 | 6005354444640501350400 |
| 12 | 98553538944200922572390400 |
| 13 | 3514155297016560613680059596800 |
| 14 | 270315783633381492859539110078054400 |
| 15 | 44596108353446508026919663976179916800000 |