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 | 4 |
| 6 | 24 |
| 7 | 139 |
| 8 | 1046 |
| 9 | 9398 |
| 10 | 101668 |
| 11 | 1278335 |
| 12 | 18248616 |
| 13 | 290147706 |
| 14 | 5071909933 |