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 | -462 |
| 2 | -24948 |
| 3 | -2518824 |
| 4 | -654112074 |
| 5 | -212483064024 |
| 6 | -76819071738024 |
| 7 | -29728723632736128 |
| 8 | -12066341379893331300 |
| 9 | -5073593348593538950566 |
| 10 | -2192302482140061697816872 |
| 11 | -968086916154014421082349304 |
| 12 | -435126775136273350146250044888 |