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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 32 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | -62 |
| 13 | 315 |
| 14 | -1002 |
| 15 | 2505 |
| 16 | -5377 |
| 17 | 10373 |
| 18 | -18544 |
| 19 | 32086 |
| 20 | -60468 |
| 21 | 154687 |
| 22 | -567986 |
| 23 | 2422043 |
| 24 | -10225382 |
| 25 | 40740231 |
| 26 | -152497274 |
| 27 | 539809668 |
| 28 | -1822828757 |
| 29 | 5928049329 |
| 30 | -18782176673 |
| 31 | 58918636670 |
| 32 | -187382010256 |
| 33 | 623524250516 |