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 | 16 |
| 5 | 54 |
| 6 | 232 |
| 7 | 1132 |
| 8 | 6024 |
| 9 | 36262 |
| 10 | 242080 |
| 11 | 1775316 |
| 12 | 14135584 |
| 13 | 122077832 |
| 14 | 1131066448 |
| 15 | 11230979624 |
| 16 | 118638940864 |