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 | 3 |
| 1 | -25 |
| 2 | -35 |
| 3 | -117 |
| 4 | -279 |
| 5 | -757 |
| 6 | -1955 |
| 7 | -5145 |
| 8 | -13443 |
| 9 | -35221 |
| 10 | -92183 |
| 11 | -241365 |
| 12 | -631875 |
| 13 | -1654297 |
| 14 | -4330979 |
| 15 | -11338677 |
| 16 | -29685015 |
| 17 | -77716405 |
| 18 | -203464163 |
| 19 | -532676121 |
| 20 | -1394564163 |
| 21 | -3651016405 |
| 22 | -9558485015 |
| 23 | -25024438677 |
| 24 | -65514830979 |
| 25 | -171520054297 |