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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 27 |
| 6 | 131 |
| 7 | 711 |
| 8 | 5055 |
| 9 | 41607 |
| 10 | 389759 |
| 11 | 4065605 |
| 12 | 46612528 |
| 13 | 581713045 |
| 14 | 7846380548 |
| 15 | 113718755478 |
| 16 | 1762208816647 |
| 17 | 29073392136390 |
| 18 | 508777045979418 |