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 | 2 |
| 4 | 12 |
| 5 | 68 |
| 6 | 400 |
| 7 | 2496 |
| 8 | 17338 |
| 9 | 127660 |
| 10 | 1030524 |
| 11 | 8852398 |
| 12 | 82121018 |
| 13 | 806839236 |
| 14 | 8481362264 |
| 15 | 93933923996 |
| 16 | 1104325114202 |