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 | -252 |
| 2 | -40068 |
| 3 | -10158624 |
| 4 | -3362961924 |
| 5 | -1254502939032 |
| 6 | -502480721822688 |
| 7 | -211053631376919744 |
| 8 | -91717692784641665028 |
| 9 | -40892713821496126310364 |
| 10 | -18600635229558474625901928 |
| 11 | -8597703758971125751979122656 |