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 | -11 |
| 3 | -181 |
| 4 | -9239 |
| 5 | -148681 |
| 6 | -49402979 |
| 7 | 6471717251 |
| 8 | 42662277841 |
| 9 | 658656817939439 |
| 10 | 133531458273294661 |
| 11 | 168943525289665105979 |
| 12 | 19015164932231993967289 |
| 13 | 62294481438650615377602599 |
| 14 | 18546969159687034895328945901 |
| 15 | 27398539855607539080934584895859 |