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 | -1678 |
| 3 | -10084 |
| 4 | 8447020 |
| 5 | 84739192 |
| 6 | -70869959816 |
| 7 | -996927845296 |
| 8 | 832429051182992 |
| 9 | 15079519188668960 |
| 10 | -12571151938430794976 |
| 11 | -278779816630273497152 |
| 12 | 232033893531586021651648 |
| 13 | 6090959605928612309819264 |
| 14 | -5061471196749802724815296640 |