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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 5 |
| 9 | 4 |
| 10 | 19 |
| 11 | 26 |
| 12 | 163 |
| 13 | 445 |
| 14 | 2302 |
| 15 | 10795 |
| 16 | 63624 |
| 17 | 381626 |
| 18 | 2547990 |
| 19 | 17919970 |