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 | 11 |
| 4 | 55 |
| 5 | 275 |
| 6 | 1444 |
| 7 | 7609 |
| 8 | 40220 |
| 9 | 212051 |
| 10 | 1114206 |
| 11 | 5840287 |
| 12 | 30521627 |
| 13 | 159166728 |
| 14 | 828130291 |
| 15 | 4301636648 |