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 | 1 |
| 7 | -6 |
| 8 | 9 |
| 9 | -1 |
| 10 | 1 |
| 11 | -9 |
| 12 | 26 |
| 13 | -24 |
| 14 | 1 |
| 15 | 1 |
| 16 | -12 |
| 17 | 52 |
| 18 | -96 |
| 19 | 64 |
| 20 | -1 |
| 21 | 1 |
| 22 | -15 |
| 23 | 87 |
| 24 | -243 |
| 25 | 326 |
| 26 | -168 |
| 27 | 1 |
| 28 | 1 |
| 29 | -18 |
| 30 | 131 |
| 31 | -492 |
| 32 | 1003 |
| 33 | -1050 |
| 34 | 441 |
| 35 | -1 |
| 36 | 1 |
| 37 | -21 |
| 38 | 184 |
| 39 | -870 |
| 40 | 2392 |
| 41 | -3816 |
| 42 | 3265 |
| 43 | -1155 |
| 44 | 1 |
| 45 | 1 |
| 46 | -24 |
| 47 | 246 |
| 48 | -1404 |
| 49 | 4871 |
| 50 | -10500 |
| 51 | 13710 |