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 | 0 |
| 5 | 4 |
| 6 | 5 |
| 7 | -2 |
| 8 | -13 |
| 9 | -12 |
| 10 | 12 |
| 11 | 40 |
| 12 | 25 |
| 13 | -52 |
| 14 | -117 |
| 15 | -38 |
| 16 | 196 |
| 17 | 324 |
| 18 | -3 |
| 19 | -678 |
| 20 | -841 |
| 21 | 360 |
| 22 | 2200 |
| 23 | 2000 |
| 24 | -2079 |
| 25 | -6760 |
| 26 | -4121 |
| 27 | 8918 |
| 28 | 19720 |
| 29 | 6084 |
| 30 | -33435 |
| 31 | -54442 |
| 32 | 1547 |
| 33 | 115228 |
| 34 | 140772 |
| 35 | -63880 |
| 36 | -372775 |
| 37 | -332892 |
| 38 | 359763 |
| 39 | 1142322 |
| 40 | 678796 |
| 41 | -1528956 |
| 42 | -3323203 |