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) |
|---|---|
| 3 | 5 |
| 4 | 56 |
| 5 | 580 |
| 6 | 5894 |
| 7 | 60312 |
| 8 | 624240 |
| 9 | 6540510 |
| 10 | 69323910 |
| 11 | 742518832 |
| 12 | 8028001566 |
| 13 | 87526544560 |
| 14 | 961412790002 |
| 15 | 10630964761766 |
| 16 | 118257400015312 |
| 17 | 1322564193698320 |
| 18 | 14863191405246888 |
| 19 | 167771227744292160 |
| 20 | 1901345329566422790 |