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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 36 |
| 4 | 400 |
| 5 | 5400 |
| 6 | 86436 |
| 7 | 1605632 |
| 8 | 34012224 |
| 9 | 810000000 |
| 10 | 21435888100 |
| 11 | 624333422592 |
| 12 | 19851622826256 |
| 13 | 684376513673216 |
| 14 | 25430282226562500 |
| 15 | 1013309916158361600 |
| 16 | 43104723599206637824 |
| 17 | 1949779138161985486848 |