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 | 2 |
| 2 | 32 |
| 3 | -448 |
| 4 | 258 |
| 5 | 82432 |
| 6 | -1067584 |
| 7 | -5811456 |
| 8 | 340793856 |
| 9 | -2998521854 |
| 10 | -51094125376 |
| 11 | 1517473732032 |
| 12 | -6428001477632 |
| 13 | -345000533911040 |
| 14 | 6658043297901184 |
| 15 | 8307326726656256 |
| 16 | -2094184270312728574 |
| 17 | 27053603162176532480 |
| 18 | 250115549146474154720 |
| 19 | -11797456310343541979456 |