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 | 3 |
| 3 | 19 |
| 4 | 104 |
| 5 | 719 |
| 6 | 5123 |
| 7 | 37936 |
| 8 | 286606 |
| 9 | 2202201 |
| 10 | 17119423 |
| 11 | 134401246 |
| 12 | 1063570767 |
| 13 | 8473332319 |