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 | 1 |
| 2 | 16 |
| 3 | 360 |
| 4 | 9104 |
| 5 | 246020 |
| 6 | 6940128 |
| 7 | 201819688 |
| 8 | 6003642144 |
| 9 | 181770021702 |
| 10 | 5581576203840 |
| 11 | 173384554507648 |
| 12 | 5438172832075920 |