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 | 12 |
| 2 | 96 |
| 3 | 792 |
| 4 | 6816 |
| 5 | 60072 |
| 6 | 535536 |
| 7 | 4799352 |
| 8 | 43112256 |
| 9 | 387682632 |
| 10 | 3487832976 |
| 11 | 31385253912 |
| 12 | 282446313696 |
| 13 | 2541932937192 |
| 14 | 22877060890416 |
| 15 | 205892205836472 |
| 16 | 1853024483819136 |
| 17 | 16677198879535752 |
| 18 | 150094704016475856 |