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) |
|---|---|
| 4 | 4 |
| 5 | 0 |
| 6 | 40 |
| 7 | 168 |
| 8 | 1652 |
| 9 | 9408 |
| 10 | 117896 |
| 11 | 1019260 |
| 12 | 12737856 |
| 13 | 140794368 |
| 14 | 2072921376 |
| 15 | 25990014896 |
| 16 | 439692361160 |