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 | 3 |
| 3 | -10 |
| 4 | -117 |
| 5 | 5224 |
| 6 | -23010 |
| 7 | -10319891 |
| 8 | 463834315 |
| 9 | 69461529092 |
| 10 | -10005601418172 |
| 11 | -1323175060249241 |
| 12 | 468450359815048182 |
| 13 | 63281374513705043227 |
| 14 | -46495538420749056681263 |
| 15 | -7147072328212024308730535 |
| 16 | 9119277358213513566069911755 |
| 17 | 1827085356172328516064256064092 |