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 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -2 |
| 6 | 1 |
| 7 | -1 |
| 8 | 1 |
| 9 | 2 |
| 10 | -5 |
| 11 | 2 |
| 12 | 4 |
| 13 | -4 |
| 14 | 1 |
| 15 | 1 |
| 16 | 0 |
| 17 | -4 |
| 18 | 2 |
| 19 | 12 |
| 20 | -14 |
| 21 | -20 |
| 22 | 48 |
| 23 | -14 |
| 24 | -50 |
| 25 | 60 |
| 26 | -10 |
| 27 | -28 |
| 28 | 24 |
| 29 | -8 |
| 30 | 1 |
| 31 | -1 |
| 32 | 1 |
| 33 | 4 |
| 34 | -10 |
| 35 | -8 |
| 36 | 54 |
| 37 | -24 |
| 38 | -180 |
| 39 | 270 |
| 40 | 270 |
| 41 | -960 |
| 42 | 150 |
| 43 | 2064 |
| 44 | -2040 |
| 45 | -2352 |
| 46 | 5871 |
| 47 | -1566 |
| 48 | -7236 |
| 49 | 8880 |
| 50 | 120 |
| 51 | -9120 |
| 52 | 7980 |
| 53 | 120 |
| 54 | -5340 |
| 55 | 4212 |
| 56 | -756 |