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 | 8 |
| 2 | -514 |
| 3 | -13360 |
| 4 | 784396 |
| 5 | 37163488 |
| 6 | -1969596536 |
| 7 | -144639748672 |
| 8 | 6811869595280 |
| 9 | 723309154621568 |
| 10 | -29648872397674016 |
| 11 | -4417917892894055168 |
| 12 | 153164187561258952384 |
| 13 | 31867992005603238264320 |
| 14 | -895931769290473862098816 |
| 15 | -265043245463665194931667968 |