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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 14 |
| 6 | 72 |
| 7 | 316 |
| 8 | 1730 |
| 9 | 9728 |
| 10 | 64330 |
| 11 | 444890 |
| 12 | 3645441 |
| 13 | 28758111 |
| 14 | 265434293 |
| 15 | 2522822881 |
| 16 | 25717118338 |