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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 1 |
| 5 | -17 |
| 6 | -2719 |
| 7 | -33231617 |
| 8 | -1990664248298239 |
| 9 | 825155821714086784897292716543 |
| 10 | -6468873315977272230111786035347284128217298704834756326835199 |