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 | -144 |
| 2 | -6912 |
| 3 | -7563456 |
| 4 | -1885022208 |
| 5 | -979976901600 |
| 6 | -383134788854784 |
| 7 | -179914112738674560 |
| 8 | -80649007527361757184 |
| 9 | -38019764211792500474064 |
| 10 | -17921855069499640580651520 |
| 11 | -8604055343353988623666807872 |