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 | -1 |
| 3 | -53 |
| 4 | -23 |
| 5 | -92713 |
| 6 | -742031 |
| 7 | 594673187 |
| 8 | 329366540401 |
| 9 | 104491760828591 |
| 10 | 1508486324285153 |
| 11 | -582710832978168221 |
| 12 | -1084662989735717135537 |
| 13 | -431265609837882130202597 |
| 14 | 784759327625761394688977441 |