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 | -2 |
| 3 | -6 |
| 4 | -10 |
| 5 | 10 |
| 6 | 190 |
| 7 | 1106 |
| 8 | 4438 |
| 9 | 9978 |
| 10 | -35250 |
| 11 | -666622 |
| 12 | -5657370 |
| 13 | -35308182 |
| 14 | -155215970 |
| 15 | -128513870 |
| 16 | 7051468022 |
| 17 | 105057922906 |
| 18 | 1042016038254 |
| 19 | 8053738122466 |
| 20 | 44608555196294 |
| 21 | 48639210067658 |
| 22 | -3200193654245442 |
| 23 | -60669816166988654 |
| 24 | -769281697485061994 |