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) |
|---|---|
| 2 | 1 |
| 3 | 12 |
| 4 | 160 |
| 5 | 2688 |
| 6 | 55296 |
| 7 | 1351680 |
| 8 | 38338560 |
| 9 | 1238630400 |
| 10 | 44920995840 |
| 11 | 1807409479680 |
| 12 | 79906524364800 |
| 13 | 3850733459865600 |
| 14 | 200907832688640000 |
| 15 | 11282983883794022400 |
| 16 | 678650586195610828800 |
| 17 | 43527244493925384192000 |