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) |
|---|---|
| 22 | 1 |
| 23 | -22 |
| 24 | 231 |
| 25 | -1540 |
| 26 | 7293 |
| 27 | -25872 |
| 28 | 69971 |
| 29 | -140822 |
| 30 | 183711 |
| 31 | -25102 |
| 32 | -634480 |
| 33 | 2027804 |
| 34 | -3817814 |
| 35 | 4439116 |
| 36 | -919600 |
| 37 | -9829270 |
| 38 | 27660479 |
| 39 | -44779042 |
| 40 | 43632974 |
| 41 | -1898820 |
| 42 | -92518261 |
| 43 | 219961214 |
| 44 | -313463842 |
| 45 | 267448104 |
| 46 | 15757973 |
| 47 | -547042056 |
| 48 | 1173033400 |