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 | 24 |
| 3 | 5760 |
| 4 | 322560 |
| 5 | 51609600 |
| 6 | 13624934400 |
| 7 | 19837904486400 |
| 8 | 2116043145216 |
| 9 | 20720294477955072 |
| 10 | 15747423803245854720 |
| 11 | 131978409017679544320 |
| 12 | 72852081777759108464640 |
| 13 | 151532330097738945606451200 |
| 14 | 2828603495157793651320422400 |
| 15 | 19687080326298243813190139904000 |