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 | 2 |
| 3 | 7 |
| 4 | 62 |
| 5 | 459 |
| 6 | 4040 |
| 7 | 35386 |
| 8 | 321639 |
| 9 | 2958100 |
| 10 | 27585931 |
| 11 | 259670736 |