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 | 3 |
| 2 | 18 |
| 3 | 126 |
| 4 | 936 |
| 5 | 7164 |
| 6 | 55800 |
| 7 | 439560 |
| 8 | 3489696 |