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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 60 |
| 6 | 7848 |
| 7 | 3459383 |
| 8 | 2585136675 |
| 9 | 2807105250897 |
| 10 | 4221456117363365 |
| 11 | 8516994770090547979 |
| 12 | 22470883218081146186209 |
| 13 | 75883288444204588922998674 |
| 14 | 322040154704144697047052726990 |