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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | -11 |
| 5 | 1 |
| 6 | 1 |
| 7 | -37 |
| 8 | 46 |
| 9 | -1 |
| 10 | 1 |
| 11 | -79 |
| 12 | 367 |
| 13 | -130 |
| 14 | 1 |
| 15 | 1 |
| 16 | -137 |
| 17 | 1444 |
| 18 | -2083 |
| 19 | 295 |
| 20 | -1 |
| 21 | 1 |
| 22 | -211 |
| 23 | 4013 |
| 24 | -13820 |
| 25 | 8518 |
| 26 | -581 |
| 27 | 1 |
| 28 | 1 |
| 29 | -301 |
| 30 | 9066 |
| 31 | -58277 |
| 32 | 89402 |
| 33 | -27966 |
| 34 | 1036 |
| 35 | -1 |
| 36 | 1 |
| 37 | -407 |
| 38 | 17851 |
| 39 | -186166 |
| 40 | 548591 |
| 41 | -442118 |
| 42 | 78354 |