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 | 0 |
| 4 | 0 |
| 5 | 18 |
| 6 | 0 |
| 7 | 129 |
| 8 | 1390 |
| 9 | 29987 |
| 10 | 1015304 |
| 11 | 59286916 |
| 12 | 5764417079 |