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 | 4 |
| 4 | 60 |
| 5 | 374 |
| 6 | 1960 |
| 7 | 9103 |
| 8 | 40497 |
| 9 | 174127 |
| 10 | 735268 |
| 11 | 3064477 |
| 12 | 12664101 |
| 13 | 52005445 |
| 14 | 212595280 |
| 15 | 866047122 |