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 | 1 |
| 4 | 4 |
| 5 | 1 |
| 6 | 26 |
| 7 | 1 |
| 8 | 175 |
| 9 | 365 |
| 10 | 1513 |
| 11 | 1 |
| 12 | 52611 |
| 13 | 989 |
| 14 | 426897 |
| 15 | 3072870 |
| 16 | 11132038 |
| 17 | 1 |
| 18 | 879525398 |
| 19 | 316025138 |