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) |
|---|---|
| 3 | 1 |
| 4 | -104 |
| 5 | 13546 |
| 6 | -1679704 |
| 7 | 210302171 |
| 8 | -26279294704 |
| 9 | 3285123767796 |
| 10 | -410635172794704 |
| 11 | 51329529054158421 |
| 12 | -6416187820400919704 |
| 13 | 802023560334345174046 |
| 14 | -100252942972187432169704 |