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 | 5 |
| 4 | 22 |
| 5 | 99 |
| 6 | 580 |
| 7 | 3557 |
| 8 | 23295 |
| 9 | 155437 |
| 10 | 1057516 |
| 11 | 7271980 |
| 12 | 50478035 |
| 13 | 352901040 |