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 | -36 |
| 2 | -3672 |
| 3 | -2240784 |
| 4 | -719628768 |
| 5 | -337401534456 |
| 6 | -143188210269216 |
| 7 | -66549102831096480 |
| 8 | -30753876262814297856 |
| 9 | -14619380361359418716724 |
| 10 | -7003704012123711964880592 |
| 11 | -3398241529278572532519050928 |
| 12 | -1661531038403129009358413705856 |