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 | -24 |
| 2 | 288 |
| 3 | -2688 |
| 4 | -32256 |
| 5 | 2820096 |
| 6 | -95035392 |
| 7 | 1972076544 |
| 8 | -9841803264 |
| 9 | -1288894414848 |
| 10 | 70351960670208 |
| 11 | -2164060518875136 |
| 12 | 36664809432809472 |
| 13 | 365875642245316608 |
| 14 | -55960058736918134784 |
| 15 | 2436570173137823465472 |
| 16 | -64272155689216515244032 |
| 17 | 664295705652718630600704 |
| 18 | 35692460661517822602510336 |