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 | -3 |
| 5 | 1 |
| 6 | 2 |
| 7 | -8 |
| 8 | 6 |
| 9 | -1 |
| 10 | 8 |
| 11 | -36 |
| 12 | 35 |
| 13 | -11 |
| 14 | 1 |
| 15 | 56 |
| 16 | -268 |
| 17 | 295 |
| 18 | -119 |
| 19 | 19 |
| 20 | -1 |
| 21 | 672 |
| 22 | -3328 |
| 23 | 3914 |
| 24 | -1786 |
| 25 | 361 |
| 26 | -32 |
| 27 | 1 |
| 28 | 13440 |
| 29 | -67904 |
| 30 | 82936 |
| 31 | -40496 |
| 32 | 9237 |
| 33 | -1027 |
| 34 | 53 |
| 35 | -1 |
| 36 | 443520 |
| 37 | -2267712 |
| 38 | 2832024 |
| 39 | -1437872 |
| 40 | 350799 |
| 41 | -43879 |
| 42 | 2822 |