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 | 4 |
| 3 | 1 |
| 4 | 21 |
| 5 | 1 |
| 6 | 21 |
| 7 | 843 |
| 8 | 720 |
| 9 | 556841 |
| 10 | 99357 |
| 11 | 458 |
| 12 | 32 |
| 13 | 3600 |
| 14 | 30580044 |
| 15 | 826720 |
| 16 | 4 |