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) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 82 |
| 5 | 765 |
| 6 | 7266 |
| 7 | 69930 |
| 8 | 679764 |
| 9 | 6659037 |
| 10 | 65635570 |
| 11 | 650194974 |
| 12 | 6467730204 |
| 13 | 64562259762 |
| 14 | 646399361076 |
| 15 | 6488447895540 |
| 16 | 65276186864232 |
| 17 | 657998685456093 |
| 18 | 6644370824416530 |
| 19 | 67198463606576790 |
| 20 | 680568874690989900 |