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 | 6 |
| 3 | 102 |
| 4 | 3420 |
| 5 | 191700 |
| 6 | 16291800 |
| 7 | 1966015800 |
| 8 | 321188943600 |
| 9 | 68482943802000 |
| 10 | 18508629682620000 |
| 11 | 6191158589749980000 |
| 12 | 2512773755138326680000 |
| 13 | 1216899394130358698760000 |
| 14 | 693258145152338464498800000 |