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 | 8 |
| 3 | 6 |
| 4 | -792 |
| 5 | -10790 |
| 6 | 281940 |
| 7 | 13531350 |
| 8 | -260660176 |
| 9 | -33714262350 |
| 10 | 550333492140 |
| 11 | 158933551076014 |
| 12 | -2777269276818168 |
| 13 | -1301993178430302774 |
| 14 | 33725324008920743108 |
| 15 | 17091479764089813623430 |