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 | 8 |
| 1 | -37 |
| 2 | 181 |
| 3 | -865 |
| 4 | 4105 |
| 5 | -19441 |
| 6 | 92017 |
| 7 | -435457 |
| 8 | 2060641 |
| 9 | -9751105 |
| 10 | 46142785 |
| 11 | -218350081 |
| 12 | 1033243777 |
| 13 | -4889362177 |
| 14 | 23136710401 |
| 15 | -109484089345 |
| 16 | 518084273665 |
| 17 | -2451601105921 |
| 18 | 11601100993537 |
| 19 | -54896999325697 |
| 20 | 259775389992961 |
| 21 | -1229270344003585 |
| 22 | 5816969724063745 |
| 23 | -27526196280360961 |