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 | 1 |
| 3 | 18 |
| 4 | 1 |
| 5 | 118 |
| 6 | 600 |
| 7 | 1 |
| 8 | 412 |
| 9 | 11772 |
| 10 | 35280 |
| 11 | 1 |
| 12 | 1060 |
| 13 | 97308 |
| 14 | 1494576 |
| 15 | 3265920 |
| 16 | 1 |
| 17 | 2270 |
| 18 | 508708 |
| 19 | 23753736 |
| 20 | 249815520 |
| 21 | 439084800 |
| 22 | 1 |
| 23 | 4298 |
| 24 | 1989148 |
| 25 | 218417400 |
| 26 | 6710001408 |
| 27 | 54187574400 |
| 28 | 80951270400 |
| 29 | 1 |
| 30 | 7448 |
| 31 | 6355048 |
| 32 | 1402502400 |