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 | -5 |
| 2 | -171 |
| 3 | 2815 |
| 4 | 163305 |
| 5 | -4560125 |
| 6 | -389093571 |
| 7 | 15247993735 |
| 8 | 1730774795985 |
| 9 | -87230967310325 |
| 10 | -12373627121809371 |
| 11 | 762240242336496655 |
| 12 | 129743913678787540665 |
| 13 | -9445699930131209919725 |
| 14 | -1875748758904668008579571 |
| 15 | 157568683906141461793511575 |
| 16 | 35760388081788065845786749345 |