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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | -2 |
| 6 | 3 |
| 7 | -1 |
| 8 | 0 |
| 9 | 0 |
| 10 | -4 |
| 11 | 8 |
| 12 | -5 |
| 13 | 1 |
| 14 | 0 |
| 15 | -8 |
| 16 | 20 |
| 17 | -18 |
| 18 | 7 |
| 19 | -1 |
| 20 | -16 |
| 21 | 48 |
| 22 | -56 |
| 23 | 32 |
| 24 | -9 |
| 25 | -31 |
| 26 | 112 |
| 27 | -160 |
| 28 | 120 |
| 29 | -50 |
| 30 | -53 |
| 31 | 255 |
| 32 | -432 |
| 33 | 400 |
| 34 | -220 |
| 35 | -56 |
| 36 | 563 |
| 37 | -1119 |
| 38 | 1232 |
| 39 | -840 |
| 40 | 108 |
| 41 | 1182 |
| 42 | -2801 |
| 43 | 3583 |
| 44 | -2912 |
| 45 | 1056 |
| 46 | 2256 |
| 47 | -6784 |
| 48 | 9967 |
| 49 | -9407 |
| 50 | 5024 |