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 | 12 |
| 3 | 192 |
| 4 | 6480 |
| 5 | 179200 |
| 6 | 4410000 |
| 7 | 133402500 |
| 8 | 4249941696 |
| 9 | 122367445200 |
| 10 | 3480673996800 |
| 11 | 117643011932160 |
| 12 | 3659449159080000 |
| 13 | 106518477825760000 |
| 14 | 3521767173114190000 |
| 15 | 114708987924290760000 |
| 16 | 3525270042097046880000 |
| 17 | 110552468520163390156800 |