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 | 48 |
| 2 | 1176 |
| 3 | 19648 |
| 4 | 252204 |
| 5 | 2655456 |
| 6 | 23901760 |
| 7 | 189208704 |
| 8 | 1344644814 |
| 9 | 8713158928 |
| 10 | 52107076128 |
| 11 | 290374290624 |
| 12 | 1519725061816 |
| 13 | 7518508799904 |
| 14 | 35352238216704 |
| 15 | 158716136933504 |
| 16 | 683059486979301 |
| 17 | 2827559773199856 |