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 | -2 |
| 3 | -4 |
| 4 | -16 |
| 5 | -48 |
| 6 | -160 |
| 7 | -576 |
| 8 | -2304 |
| 9 | -14336 |
| 10 | -73728 |