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 | 19 |
| 6 | 476 |
| 7 | 7180 |
| 8 | 86637 |
| 9 | 954456 |
| 10 | 9919519 |
| 11 | 99655858 |
| 12 | 979052296 |
| 13 | 9484975460 |
| 14 | 91050561862 |
| 15 | 868774394325 |
| 16 | 8257228721817 |
| 17 | 78288453457352 |
| 18 | 741199448968875 |