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 | 6 |
| 5 | 26 |
| 6 | 164 |
| 7 | 1529 |
| 8 | 21439 |
| 9 | 461481 |
| 10 | 15616226 |
| 11 | 851607867 |
| 12 | 76555549499 |
| 13 | 11550559504086 |