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 | -9 |
| 2 | 191 |
| 3 | -4809 |
| 4 | 135191 |
| 5 | -4064809 |
| 6 | 127935191 |
| 7 | -4162064809 |
| 8 | 138837935191 |
| 9 | -4723162064809 |
| 10 | 163236837935191 |
| 11 | -5715363162064809 |
| 12 | 202296636837935191 |
| 13 | -7226703363162064809 |
| 14 | 260217296636837935191 |
| 15 | -9434627703363162064809 |
| 16 | 344142072296636837935191 |