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 | 1 |
| 5 | 3 |
| 6 | 28 |
| 7 | 199 |
| 8 | 1603 |
| 9 | 12234 |
| 10 | 93270 |
| 11 | 697641 |
| 12 | 5167477 |
| 13 | 37913465 |