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 | -24 |
| 2 | -2592 |
| 3 | -1525536 |
| 4 | -499930368 |
| 5 | -233042911056 |
| 6 | -99547207597440 |
| 7 | -46277719207526208 |
| 8 | -21444241881136232448 |
| 9 | -10206632934331485363576 |
| 10 | -4897739115250118143468992 |
| 11 | -2379385980983995218900931680 |
| 12 | -1164826509542958652906666171392 |