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 | 12 |
| 2 | 20 |
| 3 | 412 |
| 4 | 712 |
| 5 | 2092 |
| 6 | 4704 |
| 7 | 10176 |
| 8 | 33396 |
| 9 | 41124 |
| 10 | 105604 |
| 11 | 139780 |
| 12 | 142924 |