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 | 5 |
| 4 | -2 |
| 5 | 1 |
| 6 | -31 |
| 7 | 15 |
| 8 | -3 |
| 9 | 1 |
| 10 | 257 |
| 11 | -124 |
| 12 | 30 |
| 13 | -4 |
| 14 | 1 |
| 15 | -2671 |
| 16 | 1285 |
| 17 | -310 |
| 18 | 50 |
| 19 | -5 |
| 20 | 1 |
| 21 | 33305 |
| 22 | -16026 |
| 23 | 3855 |
| 24 | -620 |
| 25 | 75 |
| 26 | -6 |
| 27 | 1 |
| 28 | -484471 |
| 29 | 233135 |
| 30 | -56091 |
| 31 | 8995 |
| 32 | -1085 |
| 33 | 105 |
| 34 | -7 |
| 35 | 1 |
| 36 | 8054177 |
| 37 | -3875768 |
| 38 | 932540 |
| 39 | -149576 |
| 40 | 17990 |
| 41 | -1736 |
| 42 | 140 |
| 43 | -8 |
| 44 | 1 |