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 | 20160 |
| 3 | 12130560 |
| 4 | 660602880 |
| 5 | 29016000000 |
| 6 | 244552089600 |
| 7 | 4635182361600 |
| 8 | 21646635171840 |
| 9 | 174060277297920 |
| 10 | 584962560000000 |
| 11 | 4139330225184000 |
| 12 | 8013482872012800 |
| 13 | 50858076935877120 |
| 14 | 93445276409856000 |
| 15 | 351980328960000000 |
| 16 | 709316941310853120 |
| 17 | 2851903720876769280 |