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 | 4 |
| 2 | 58 |
| 3 | 1422 |
| 4 | 49000 |
| 5 | 2174360 |
| 6 | 118023264 |
| 7 | 7574532826 |
| 8 | 561071549056 |
| 9 | 47111034709260 |
| 10 | 4421715905632000 |
| 11 | 458741213603157254 |
| 12 | 52129735913348001792 |
| 13 | 6439324687323193520608 |
| 14 | 859089518697047400878080 |
| 15 | 123108032319553206480143250 |
| 16 | 18858657171509448248927617024 |