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 | 0 |
| 1 | 40 |
| 2 | 3960 |
| 3 | 388080 |
| 4 | 38027920 |
| 5 | 3726348120 |
| 6 | 365144087880 |
| 7 | 35780394264160 |
| 8 | 3506113493799840 |
| 9 | 343563341998120200 |
| 10 | 33665701402321979800 |
| 11 | 3298895174085555900240 |
| 12 | 323258061358982156243760 |
| 13 | 31675991118006165755988280 |
| 14 | 3103923871503245261930607720 |