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 | 1 |
| 2 | -129 |
| 3 | 2188 |
| 4 | -16257 |
| 5 | 78126 |
| 6 | -282252 |
| 7 | 823544 |
| 8 | -2080641 |
| 9 | 4785157 |
| 10 | -10078254 |
| 11 | 19487172 |
| 12 | -35570316 |
| 13 | 62748518 |
| 14 | -106237176 |
| 15 | 170939688 |
| 16 | -266321793 |
| 17 | 410338674 |
| 18 | -617285253 |
| 19 | 893871740 |
| 20 | -1270094382 |
| 21 | 1801914272 |
| 22 | -2513845188 |
| 23 | 3404825448 |
| 24 | -4552442508 |