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 | 9 |
| 3 | 80 |
| 4 | 656 |
| 5 | 4180 |
| 6 | 68080 |
| 7 | 1643372 |
| 8 | 58423188 |
| 9 | 3045734096 |
| 10 | 235680645520 |
| 11 | 26923774835716 |
| 12 | 4558306996574952 |