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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 14 |
| 5 | 82 |
| 6 | 585 |
| 7 | 4418 |
| 8 | 34838 |
| 9 | 280014 |
| 10 | 2285047 |
| 11 | 18838395 |
| 12 | 156644526 |
| 13 | 1311575691 |