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 | 9 |
| 3 | 31 |
| 4 | 176 |
| 5 | 1057 |
| 6 | 7422 |
| 7 | 53709 |
| 8 | 407198 |
| 9 | 3198946 |
| 10 | 25773602 |
| 11 | 212205881 |
| 12 | 1777532673 |