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 | -126 |
| 2 | -27972 |
| 3 | -8603784 |
| 4 | -3156774138 |
| 5 | -1265670056952 |
| 6 | -536028623834760 |
| 7 | -235629947944839168 |
| 8 | -106414175763732002292 |
| 9 | -49052892961209924090486 |
| 10 | -22977990271885179647877768 |
| 11 | -10904016663130642099838196120 |