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 | 9 |
| 3 | 13 |
| 4 | 25 |
| 5 | 133 |
| 6 | 193 |
| 7 | 18673 |
| 8 | 57313 |
| 9 | 1032313 |
| 10 | 4387273 |
| 11 | 3450430573 |
| 12 | 11717813053 |
| 13 | 21691948933 |