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 | 16 |
| 5 | 40 |
| 6 | 204 |
| 7 | 840 |
| 8 | 6272 |
| 9 | 35856 |
| 10 | 378000 |
| 11 | 2638460 |
| 12 | 28387728 |
| 13 | 249444936 |
| 14 | 3275745564 |
| 15 | 30770034480 |