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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 32 |
| 7 | 133 |
| 8 | 681 |
| 9 | 3893 |
| 10 | 24809 |
| 11 | 169206 |
| 12 | 1214462 |
| 13 | 9034509 |
| 14 | 69093299 |
| 15 | 539991437 |