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 | -2 |
| 2 | -3 |
| 3 | 8 |
| 4 | -6 |
| 5 | 4 |
| 6 | 26 |
| 7 | -56 |
| 8 | -7 |
| 9 | 70 |
| 10 | -51 |
| 11 | 32 |
| 12 | 120 |
| 13 | -272 |
| 14 | -200 |
| 15 | 672 |
| 16 | -182 |
| 17 | -308 |
| 18 | 1026 |
| 19 | -1744 |
| 20 | -660 |
| 21 | 3064 |
| 22 | -916 |
| 23 | -1232 |
| 24 | 2466 |
| 25 | -3700 |
| 26 | -3990 |
| 27 | 11680 |
| 28 | -1416 |
| 29 | -8848 |
| 30 | 13752 |
| 31 | -18656 |
| 32 | -8503 |
| 33 | 35662 |
| 34 | -14331 |
| 35 | -7000 |
| 36 | 27122 |
| 37 | -47244 |
| 38 | -29870 |
| 39 | 106984 |
| 40 | -25895 |
| 41 | -55194 |
| 42 | 140173 |
| 43 | -225152 |