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 | 1 |
| 2 | 0 |
| 3 | 28 |
| 4 | 496 |
| 5 | 1631432881 |
| 6 | 0 |
| 7 | 8256 |
| 8 | 2016 |
| 9 | 41616 |
| 10 | 0 |
| 11 | 169878528 |
| 12 | 2717872128 |
| 13 | 0 |