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 | -45 |
| 3 | 143 |
| 4 | 10845 |
| 5 | -58081 |
| 6 | -6467985 |
| 7 | 48571823 |
| 8 | 7193829465 |
| 9 | -69471000001 |
| 10 | -12857719720725 |
| 11 | 151763444497103 |
| 12 | 33705032917690485 |
| 13 | -470164385248041121 |
| 14 | -121821103620727531065 |
| 15 | 1960764928973430783983 |
| 16 | 580617476571375848857905 |
| 17 | -10591336845363318048877441 |