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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 34 |
| 6 | 150 |
| 7 | 674 |
| 8 | 3056 |
| 9 | 13898 |
| 10 | 63178 |
| 11 | 286570 |
| 12 | 1296008 |
| 13 | 5842442 |
| 14 | 26255254 |
| 15 | 117642282 |