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 | 0 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 39 |
| 6 | 167 |
| 7 | 900 |
| 8 | 4769 |
| 9 | 28389 |
| 10 | 180530 |
| 11 | 1209319 |
| 12 | 8398279 |
| 13 | 60070591 |
| 14 | 441296837 |
| 15 | 3314576488 |