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 | 4 |
| 3 | 13 |
| 4 | 49 |
| 5 | 161 |
| 6 | 656 |
| 7 | 2751 |
| 8 | 12505 |
| 9 | 58482 |
| 10 | 280348 |
| 11 | 1374563 |
| 12 | 6864809 |