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) |
|---|---|
| 4 | 8 |
| 5 | 25 |
| 6 | 144 |
| 7 | 735 |
| 8 | 4608 |
| 9 | 39285 |
| 10 | 362000 |
| 11 | 3628185 |
| 12 | 40808448 |
| 13 | 478988081 |
| 14 | 6227101888 |
| 15 | 87248724750 |
| 16 | 1300561920000 |
| 17 | 20922788404479 |
| 18 | 355587467242752 |
| 19 | 6402373698206889 |
| 20 | 121810906419200000 |