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 | 9 |
| 4 | 16 |
| 5 | 41 |
| 6 | 127 |
| 7 | 456 |
| 8 | 1845 |
| 9 | 8257 |
| 10 | 40338 |
| 11 | 212983 |
| 12 | 1205911 |
| 13 | 7275802 |
| 14 | 46534535 |
| 15 | 314117861 |
| 16 | 2229489144 |
| 17 | 16584674293 |
| 18 | 128934314027 |
| 19 | 1044976711816 |
| 20 | 8809644039105 |
| 21 | 77101357474077 |
| 22 | 699264675713410 |
| 23 | 6561367477780443 |
| 24 | 63603478257343891 |
| 25 | 636087039930484642 |