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 | 5 |
| 2 | 20 |
| 3 | 60 |
| 4 | 1080 |
| 5 | 30240 |
| 6 | 806400 |
| 7 | 26560800 |
| 8 | 946512000 |
| 9 | 38810016000 |
| 10 | 1754539315200 |
| 11 | 88281990720000 |
| 12 | 4861210007808000 |
| 13 | 292116146370048000 |
| 14 | 18992927542837248000 |
| 15 | 1329979704459614208000 |