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 | -108 |
| 2 | -7128 |
| 3 | -5975856 |
| 4 | -1648702944 |
| 5 | -817564231656 |
| 6 | -330392410226208 |
| 7 | -154125342449733600 |
| 8 | -69899495093389741824 |
| 9 | -33019122368612611954332 |
| 10 | -15654348707682435222420432 |
| 11 | -7540807164973158284078993424 |