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 | 2 |
| 5 | 11 |
| 6 | 77 |
| 7 | 499 |
| 8 | 3442 |
| 9 | 24128 |
| 10 | 173428 |
| 11 | 1262464 |
| 12 | 9307494 |