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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 9 |
| 3 | 4 |
| 4 | 0 |
| 5 | 6 |
| 6 | 1681 |
| 7 | 22 |
| 8 | 0 |
| 9 | 0 |
| 10 | 97969 |
| 11 | 118 |
| 12 | 16900321 |
| 13 | 914 |
| 14 | 1062961 |
| 15 | 542 |
| 16 | 0 |
| 17 | 262 |
| 18 | 2827367929 |
| 19 | 382 |