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 | -1 |
| 2 | -256 |
| 3 | -6305 |
| 4 | -26335 |
| 5 | 1321887 |
| 6 | 32565169 |
| 7 | 276211695 |
| 8 | -2659962750 |
| 9 | -111341327890 |
| 10 | -1454216029918 |
| 11 | -3323783801026 |
| 12 | 227018039015019 |
| 13 | 4636828146319845 |
| 14 | 39615489757794355 |
| 15 | -132865771935151820 |
| 16 | -9075288352543844755 |
| 17 | -132703303201618610765 |