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 | 4 |
| 4 | 38 |
| 5 | 305 |
| 6 | 2450 |
| 7 | 20939 |
| 8 | 182955 |
| 9 | 1618599 |
| 10 | 14491882 |
| 11 | 131026137 |