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 | 0 |
| 5 | 6841 |
| 6 | 96096 |
| 7 | 676941 |
| 8 | 3270656 |
| 9 | 13092246 |
| 10 | 42134592 |
| 11 | 122771382 |
| 12 | 311267712 |
| 13 | 756315207 |
| 14 | 1656283552 |
| 15 | 3448930923 |
| 16 | 6817396608 |
| 17 | 13050730268 |
| 18 | 23525987328 |