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 | 38 |
| 3 | 1158 |
| 4 | 65304 |
| 5 | 5900520 |
| 6 | 780827760 |
| 7 | 142358474160 |
| 8 | 34209760152960 |
| 9 | 10478436416945280 |
| 10 | 3984884716852972800 |
| 11 | 1842169367191937414400 |
| 12 | 1017403495472574045158400 |
| 13 | 661599650478455071589606400 |
| 14 | 500354503197888042597961267200 |
| 15 | 435447353708763072625260119808000 |