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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 20 |
| 5 | 78 |
| 6 | 342 |
| 7 | 1608 |
| 8 | 7966 |
| 9 | 41054 |
| 10 | 218342 |
| 11 | 1191038 |
| 12 | 6635164 |
| 13 | 37621952 |
| 14 | 216557220 |
| 15 | 1262829914 |
| 16 | 7447921572 |