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 | 20 |
| 3 | 142 |
| 4 | 880 |
| 5 | 5106 |
| 6 | 28252 |
| 7 | 152142 |
| 8 | 799736 |
| 9 | 4141426 |
| 10 | 21133476 |
| 11 | 106827054 |