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 | 4 |
| 5 | 133576 |
| 6 | 1052201890 |
| 7 | 2712509085687 |
| 8 | 4038807303045625 |
| 9 | 4413401558241969897 |
| 10 | 3958951571937696919325 |
| 11 | 3086290263475796210940632 |
| 12 | 2157012446699893052415292765 |