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) |
|---|---|
| 7 | 1 |
| 8 | 16 |
| 9 | 153 |
| 10 | 1140 |
| 11 | 7315 |
| 12 | 42504 |
| 13 | 230230 |
| 14 | 1184040 |
| 15 | 5852925 |
| 16 | 28048800 |
| 17 | 131128140 |
| 18 | 600805296 |
| 19 | 2707475148 |
| 20 | 12033222880 |
| 21 | 52860229080 |
| 22 | 229911617056 |
| 23 | 991493848554 |
| 24 | 4244421484512 |
| 25 | 18053528883775 |
| 26 | 76360380541900 |
| 27 | 321387366339585 |
| 28 | 1346766106565880 |
| 29 | 5621728217559090 |