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 | -7 |
| 2 | 63 |
| 3 | -693 |
| 4 | 8841 |
| 5 | -127575 |
| 6 | 2047815 |
| 7 | -36081045 |
| 8 | 690863985 |
| 9 | -14263534215 |
| 10 | 315469515375 |
| 11 | -7434244696725 |
| 12 | 185817177956025 |
| 13 | -4906778826324375 |
| 14 | 136422375634920375 |
| 15 | -3981559981797523125 |
| 16 | 121659806332798358625 |