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 | 40 |
| 2 | 1560 |
| 3 | 60840 |
| 4 | 2371980 |
| 5 | 92476800 |
| 6 | 3605409600 |
| 7 | 140564736000 |
| 8 | 5480222014020 |
| 9 | 213658376756760 |
| 10 | 8329936604744040 |
| 11 | 324760699264187160 |
| 12 | 12661502336823753660 |
| 13 | 493636212105145265520 |
| 14 | 19245481572342746507280 |