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 | 2 |
| 7 | 1 |
| 8 | 9 |
| 9 | 5 |
| 10 | 36 |
| 11 | 42 |
| 12 | 313 |
| 13 | 685 |
| 14 | 3999 |
| 15 | 16535 |
| 16 | 100897 |
| 17 | 577324 |
| 18 | 3886229 |
| 19 | 26982310 |