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) |
|---|---|
| 5 | 24 |
| 6 | 864 |
| 7 | 24696 |
| 8 | 688128 |
| 9 | 19840464 |
| 10 | 604727424 |
| 11 | 19632956112 |
| 12 | 680195957760 |
| 13 | 25130679950376 |
| 14 | 988325574652416 |
| 15 | 41277744231187464 |
| 16 | 1826323584590389248 |
| 17 | 85391029667937905184 |
| 18 | 4209030460729215184896 |
| 19 | 218223423136426488339744 |
| 20 | 11875233973816788160610304 |