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 | 22 |
| 2 | -974 |
| 3 | -85580 |
| 4 | 2377516 |
| 5 | 551407912 |
| 6 | -5201117576 |
| 7 | -4938141000848 |
| 8 | -55556496038000 |
| 9 | 56376233721055072 |
| 10 | 1969289482873847584 |
| 11 | -778641119029758302912 |
| 12 | -48713569344985450216256 |
| 13 | 12551406492954971362990720 |
| 14 | 1199447936209863593384712064 |