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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 24 |
| 6 | 92 |
| 7 | 184 |
| 8 | 704 |
| 9 | 2016 |
| 10 | 7600 |
| 11 | 15200 |
| 12 | 80664 |
| 13 | 161328 |
| 14 | 601696 |
| 15 | 2198824 |
| 16 | 9868544 |
| 17 | 19737088 |
| 18 | 102010480 |
| 19 | 204020960 |