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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 18 |
| 5 | 68 |
| 6 | 313 |
| 7 | 1592 |
| 8 | 9187 |
| 9 | 57451 |
| 10 | 384450 |
| 11 | 2703970 |
| 12 | 19769311 |