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 | -1 |
| 4 | -2 |
| 5 | 1 |
| 6 | -7 |
| 7 | -4 |
| 8 | -3 |
| 9 | 1 |
| 10 | -77 |
| 11 | -26 |
| 12 | -9 |
| 13 | -4 |
| 14 | 1 |
| 15 | -1145 |
| 16 | -287 |
| 17 | -67 |
| 18 | -16 |
| 19 | -5 |
| 20 | 1 |
| 21 | -21410 |
| 22 | -4412 |
| 23 | -798 |
| 24 | -139 |
| 25 | -25 |
| 26 | -6 |
| 27 | 1 |
| 28 | -481683 |
| 29 | -86004 |
| 30 | -13029 |
| 31 | -1830 |
| 32 | -251 |
| 33 | -36 |
| 34 | -7 |
| 35 | 1 |
| 36 | -12655196 |
| 37 | -2017658 |
| 38 | -268368 |
| 39 | -32191 |
| 40 | -3667 |
| 41 | -412 |
| 42 | -49 |
| 43 | -8 |
| 44 | 1 |
| 45 | -379998938 |
| 46 | -55134458 |
| 47 | -6630228 |
| 48 | -705680 |
| 49 | -69868 |
| 50 | -6657 |
| 51 | -631 |