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 | 0 |
| 2 | 0 |
| 3 | 7448 |
| 4 | 171584 |
| 5 | 3023432 |
| 6 | 21306432 |
| 7 | 154462184 |
| 8 | 685844864 |
| 9 | 2920347912 |
| 10 | 9889081088 |
| 11 | 32177621552 |
| 12 | 86293676352 |
| 13 | 234878672352 |
| 14 | 554074612032 |
| 15 | 1280999302448 |
| 16 | 2735778096000 |
| 17 | 5764546457280 |
| 18 | 11186777912960 |
| 19 | 21769309667880 |