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 | 7 |
| 3 | 49 |
| 4 | 127 |
| 5 | 337 |
| 6 | 889 |
| 7 | 2359 |
| 8 | 6223 |
| 9 | 16513 |
| 10 | 42799 |
| 11 | 299593 |
| 12 | 2097151 |