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 | 1 |
| 5 | 65 |
| 6 | 5042 |
| 7 | 605545 |
| 8 | 120653315 |
| 9 | 40885736829 |
| 10 | 23907349095479 |
| 11 | 24391928745798217 |