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 | -1 |
| 2 | -11 |
| 3 | -349 |
| 4 | -22455 |
| 5 | -2465241 |
| 6 | -416217603 |
| 7 | -100729124469 |
| 8 | -33198564667887 |
| 9 | -14328891118054449 |
| 10 | -7852649782447649403 |
| 11 | -5329635152693662625805 |
| 12 | -4388960085492355649955495 |