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 | 29 |
| 4 | 129 |
| 5 | 571 |
| 6 | 2525 |
| 7 | 11167 |
| 8 | 49372 |
| 9 | 218295 |
| 10 | 965177 |
| 11 | 4267457 |
| 12 | 18868240 |
| 13 | 83424514 |
| 14 | 368855252 |
| 15 | 1630865929 |
| 16 | 7210751807 |
| 17 | 31881800153 |