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 | 1 |
| 5 | 6 |
| 6 | 37 |
| 7 | 225 |
| 8 | 1395 |
| 9 | 8944 |
| 10 | 59585 |
| 11 | 413117 |
| 12 | 2981310 |
| 13 | 22380814 |
| 14 | 174600298 |
| 15 | 1413841252 |
| 16 | 11868587577 |
| 17 | 103155618776 |
| 18 | 927141821215 |
| 19 | 8606806236367 |
| 20 | 82430269073469 |
| 21 | 813600584094320 |
| 22 | 8267450613029789 |
| 23 | 86406853732930699 |
| 24 | 927993270700444588 |
| 25 | 10232636504064477996 |