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) |
|---|---|
| 0 | 1 |
| 1 | 14 |
| 2 | 155 |
| 3 | 1665 |
| 4 | 18424 |
| 5 | 214676 |
| 6 | 2655764 |
| 7 | 34967140 |
| 8 | 489896616 |
| 9 | 7292774280 |
| 10 | 115119818736 |
| 11 | 1922666722704 |
| 12 | 33896996544384 |
| 13 | 629429693586048 |
| 14 | 12283618766690304 |
| 15 | 251426391808144896 |
| 16 | 5387217520095244800 |
| 17 | 120615281647055884800 |
| 18 | 2817014230489985049600 |