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 | 0 |
| 2 | 2 |
| 3 | 12 |
| 4 | 96 |
| 5 | 1280 |
| 6 | 30720 |
| 7 | 1376256 |
| 8 | 117440512 |
| 9 | 19327352832 |
| 10 | 6184752906240 |
| 11 | 3870280929771520 |
| 12 | 4755801206503243776 |
| 13 | 11510768301994760208384 |
| 14 | 55006124792465627449131008 |
| 15 | 519934816499859715457632174080 |
| 16 | 9735556609752801803494680617287680 |
| 17 | 361550014853497117429835520396253724672 |