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 | 3 |
| 2 | 36 |
| 3 | 756 |
| 4 | 22680 |
| 5 | 884520 |
| 6 | 42456960 |
| 7 | 2420046720 |
| 8 | 159723083520 |
| 9 | 11979231264000 |
| 10 | 1006255426176000 |
| 11 | 93581754634368000 |
| 12 | 9545338972705536000 |
| 13 | 1059532625970314496000 |
| 14 | 127143915116437739520000 |
| 15 | 16401565050020468398080000 |
| 16 | 2263415976902824638935040000 |