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 | -75 |
| 4 | 3969 |
| 5 | -140595 |
| 6 | 7374191 |
| 7 | -435638203 |
| 8 | 30421321073 |
| 9 | -2409092861175 |
| 10 | 214562251828275 |
| 11 | -21195275581114635 |
| 12 | 2301157855016159905 |
| 13 | -272330254968023391035 |
| 14 | 34894294917147760652775 |
| 15 | -4812715265513253499593675 |
| 16 | 710922905477027337578759265 |
| 17 | -111981455662673544130741177455 |