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 | 4 |
| 6 | 39 |
| 7 | 456 |
| 8 | 5554 |
| 9 | 63378 |
| 10 | 698568 |
| 11 | 7391499 |
| 12 | 75807708 |