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 | 2 |
| 3 | 12 |
| 4 | 36 |
| 5 | 360 |
| 6 | 27000 |
| 7 | 75600 |
| 8 | 378000 |
| 9 | 1587600 |
| 10 | 174636000 |
| 11 | 1944810000 |
| 12 | 5762988000 |
| 13 | 42785820000 |
| 14 | 5244319080000 |
| 15 | 36710233560000 |
| 16 | 1431699108840000 |
| 17 | 65774855015100000 |
| 18 | 731189187729000000 |
| 19 | 1710146230392600000 |
| 20 | 2677277333530800000 |
| 21 | 2267653901500587600000 |
| 22 | 115650348976529967600000 |