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 | 19 |
| 6 | 63 |
| 7 | 153 |
| 8 | 1273 |
| 9 | 2090 |
| 10 | 19227 |
| 11 | 266133 |
| 12 | 868868 |
| 13 | 10631543 |
| 14 | 264365332 |
| 15 | 662822809 |
| 16 | 129102309125 |