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 | -132 |
| 2 | -76428 |
| 3 | -12686784 |
| 4 | -4629945804 |
| 5 | -1581036186312 |
| 6 | -643032851554368 |
| 7 | -264454897726360704 |
| 8 | -114830224962140965068 |
| 9 | -50847479367845783084484 |
| 10 | -23070238839261012248537688 |
| 11 | -10629338992044523324726971456 |