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 | -27 |
| 2 | 324 |
| 3 | -2223 |
| 4 | 9126 |
| 5 | -19278 |
| 6 | -5967 |
| 7 | 159030 |
| 8 | -399087 |
| 9 | 151593 |
| 10 | 1270971 |
| 11 | -2500875 |
| 12 | 74970 |
| 13 | 4203522 |
| 14 | -1004157 |
| 15 | -4796037 |
| 16 | -11750778 |
| 17 | 32885190 |
| 18 | 10452375 |
| 19 | -77533092 |
| 20 | 27104868 |
| 21 | 43070625 |
| 22 | 63798840 |
| 23 | -69960267 |
| 24 | -215939061 |
| 25 | 236414349 |
| 26 | -37046646 |
| 27 | 237487433 |
| 28 | 85921371 |