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 | 1 |
| 1 | -336 |
| 2 | -39312 |
| 3 | -8266944 |
| 4 | -2529479568 |
| 5 | -895678457184 |
| 6 | -344891780549568 |
| 7 | -140330667583849344 |
| 8 | -59379605532142099344 |
| 9 | -25873741825665005773200 |
| 10 | -11534062764689844375098592 |
| 11 | -5236325710480558290644292672 |