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) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 504 |
| 4 | 3948 |
| 5 | 30744 |
| 6 | 238224 |
| 7 | 1837752 |
| 8 | 14121282 |
| 9 | 108123624 |
| 10 | 825227424 |
| 11 | 6279994728 |
| 12 | 47663522844 |
| 13 | 360868232424 |
| 14 | 2726022470928 |
| 15 | 20549497120776 |
| 16 | 154606709405835 |
| 17 | 1161096042133440 |
| 18 | 8705061811230400 |
| 19 | 65160664171875440 |