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 | 0 |
| 2 | 5 |
| 3 | -4 |
| 4 | -39 |
| 5 | -24 |
| 6 | 1823 |
| 7 | -6566 |
| 8 | -1844 |
| 9 | -34087 |
| 10 | 84846 |
| 11 | -449836 |
| 12 | -1117632 |
| 13 | -3465179 |
| 14 | -1766196 |
| 15 | -11290074 |
| 16 | 105510354 |
| 17 | -208774399 |
| 18 | 704933861 |