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) |
|---|---|
| 0 | 1 |
| 1 | 112 |
| 2 | 14448 |
| 3 | 2393600 |
| 4 | 510205696 |
| 5 | 137602949120 |
| 6 | 46060832825344 |
| 7 | 18793914785464320 |
| 8 | 9198585089011777536 |
| 9 | 5325419604670079827968 |
| 10 | 3602492652661227322343424 |
| 11 | 2817222656974232498101813248 |
| 12 | 2523030777997770071132105342976 |
| 13 | 2566233198310773279287315980615680 |