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 | -7 |
| 2 | 49 |
| 3 | -196 |
| 4 | 1029 |
| 5 | -4802 |
| 6 | 24010 |
| 7 | -117649 |
| 8 | 588245 |
| 9 | -2941225 |
| 10 | 14823774 |
| 11 | -74942413 |
| 12 | 380476866 |
| 13 | -1936973136 |
| 14 | 9886633715 |
| 15 | -50563069571 |
| 16 | 259029803333 |
| 17 | -1328763571296 |
| 18 | 6823754590093 |
| 19 | -35073821767334 |
| 20 | 180407337377834 |
| 21 | -928487386730281 |
| 22 | 4780794440512601 |
| 23 | -24625601552074341 |
| 24 | 126883328914736618 |