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 | 2 |
| 2 | 15 |
| 3 | 131 |
| 4 | 1369 |
| 5 | 13842 |
| 6 | 129185 |
| 7 | 1104895 |
| 8 | 8750964 |
| 9 | 64714465 |
| 10 | 450686225 |
| 11 | 2976189422 |