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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 7258 |
| 9 | 688976 |
| 10 | 37466297 |
| 11 | 1512650776 |
| 12 | 50355225387 |
| 13 | 1461269893538 |
| 14 | 38236656513725 |
| 15 | 922552326544030 |
| 16 | 20847359639841664 |
| 17 | 446290728182323620 |
| 18 | 9129236228868478458 |
| 19 | 179639607187998993180 |
| 20 | 3418366706444416598777 |