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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 1 |
| 7 | 0 |
| 8 | 1 |
| 9 | 23 |
| 10 | 9 |
| 11 | 41 |
| 12 | 248 |
| 13 | 277 |
| 14 | 1556 |
| 15 | 2854 |
| 16 | 5233 |
| 17 | 20701 |
| 18 | 145137 |
| 19 | 1626890 |
| 20 | 4118910 |
| 21 | 9963276 |
| 22 | 9260756 |
| 23 | 64027363 |
| 24 | 365237571 |
| 25 | 1002679107 |
| 26 | 21594036300 |
| 27 | 24465529531 |
| 28 | 144914973347 |
| 29 | 1921444799766 |