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 | -288 |
| 2 | 6912 |
| 3 | -13136256 |
| 4 | -1543993344 |
| 5 | -1312510191552 |
| 6 | -400771816381440 |
| 7 | -207423640540991232 |
| 8 | -85808962187667652608 |
| 9 | -40835278880374417949088 |
| 10 | -18652791316021929491056128 |
| 11 | -8871850083830324974981015680 |