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) |
|---|---|
| 2 | -3 |
| 3 | 10 |
| 4 | -84 |
| 5 | -10989 |
| 6 | 363883 |
| 7 | -82620 |
| 8 | -137550709 |
| 9 | 645413252986 |
| 10 | -7142036935967 |
| 11 | -7522164033404415 |
| 12 | -217498966742521653325 |
| 13 | -10590850429623318361311 |
| 14 | 14571491290875996179048369 |
| 15 | -5355885371863393108886638462583 |