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 | 3 |
| 2 | 15 |
| 3 | 63 |
| 4 | 89 |
| 5 | 245 |
| 6 | 583 |
| 7 | 1791 |
| 8 | 2123 |
| 9 | 7233 |
| 10 | 24787 |
| 11 | 44653 |