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 | 3 |
| 3 | -14 |
| 4 | 69 |
| 5 | 2065 |
| 6 | -28888 |
| 7 | 2616119 |
| 8 | -332513754 |
| 9 | 8280062505 |
| 10 | 18784454671297 |
| 11 | -10663732503571536 |
| 12 | 8938035295591025771 |
| 13 | 31636113722016288336230 |
| 14 | -41974401721854929811774227 |
| 15 | 754388827236735824355996347601 |