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 | 0 |
| 2 | -1 |
| 3 | -2 |
| 4 | -1 |
| 5 | -4 |
| 6 | -1 |
| 7 | -2 |
| 8 | -1 |
| 9 | -4 |
| 10 | -4 |
| 11 | 7 |
| 12 | -19 |
| 13 | 22 |
| 14 | -32 |
| 15 | 26 |
| 16 | 14 |
| 17 | -20 |
| 18 | 24 |
| 19 | -125 |
| 20 | 257 |
| 21 | -362 |
| 22 | 228 |
| 23 | -10 |
| 24 | 211 |
| 25 | -1042 |
| 26 | 329 |
| 27 | 330 |
| 28 | -1703 |
| 29 | 6222 |
| 30 | -10374 |
| 31 | 9569 |
| 32 | 1814 |
| 33 | -10339 |
| 34 | -3421 |
| 35 | 8435 |
| 36 | 38176 |
| 37 | -28118 |
| 38 | 38729 |
| 39 | -135944 |
| 40 | 101597 |
| 41 | 15295 |
| 42 | -169338 |
| 43 | 259886 |
| 44 | -474483 |
| 45 | 1726370 |
| 46 | -3554573 |