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 | -6 |
| 2 | -72 |
| 3 | -1104 |
| 4 | -20238 |
| 5 | -405792 |
| 6 | -8601840 |
| 7 | -189317568 |
| 8 | -4281478272 |
| 9 | -98841343686 |
| 10 | -2318973049008 |
| 11 | -55118876238000 |
| 12 | -1324194430710912 |
| 13 | -32099173821105312 |
| 14 | -784045854628721568 |
| 15 | -19276683937074656064 |
| 16 | -476644852188898489662 |