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 | 16 |
| 2 | 4536 |
| 3 | 8607744 |
| 4 | 42506546320 |
| 5 | 456702275019600 |
| 6 | 9418598754396188616 |
| 7 | 340409678708013417037696 |
| 8 | 20126978659582117984569511584 |
| 9 | 1844705433432528416880778883815440 |