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 | 1 |
| 4 | -16 |
| 5 | 1 |
| 6 | 1 |
| 7 | -462 |
| 8 | -462 |
| 9 | 1 |
| 10 | 1 |
| 11 | -7626 |
| 12 | -8072 |
| 13 | -7626 |
| 14 | 1 |
| 15 | 1 |
| 16 | -33542202 |
| 17 | -33549812 |
| 18 | -33549812 |
| 19 | -33542202 |
| 20 | 1 |
| 21 | 1 |
| 22 | -8556318714 |
| 23 | -8589860900 |
| 24 | -8589868064 |
| 25 | -8589860900 |
| 26 | -8556318714 |
| 27 | 1 |
| 28 | 1 |
| 29 | -128848822266 |
| 30 | -137405140964 |
| 31 | -137438682704 |