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 | 0 |
| 2 | 12 |
| 3 | 148 |
| 4 | 2568 |
| 5 | 53944 |
| 6 | 1283270 |
| 7 | 33268932 |
| 8 | 918420570 |