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 | 204 |
| 5 | 26700 |
| 6 | 1073076 |
| 7 | 15657764 |
| 8 | 159413700 |
| 9 | 1108580092 |
| 10 | 6030207624 |
| 11 | 26852315940 |
| 12 | 104865006648 |
| 13 | 354993232192 |
| 14 | 1098793355508 |
| 15 | 3109294280324 |