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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | -48 |
| 4 | 960 |
| 5 | -23296 |
| 6 | 616448 |
| 7 | -16830464 |
| 8 | 456228864 |
| 9 | -11849367552 |
| 10 | 281940983808 |
| 11 | -5672090468352 |
| 12 | 75759202861056 |
| 13 | 445162740252672 |
| 14 | -73915606654517248 |
| 15 | 2987936359374651392 |
| 16 | -82722417189670879232 |