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 | -2 |
| 4 | -2 |
| 5 | 1 |
| 6 | -10 |
| 7 | -4 |
| 8 | -3 |
| 9 | 1 |
| 10 | -74 |
| 11 | -20 |
| 12 | -7 |
| 13 | -4 |
| 14 | 1 |
| 15 | -706 |
| 16 | -148 |
| 17 | -39 |
| 18 | -11 |
| 19 | -5 |
| 20 | 1 |
| 21 | -8162 |
| 22 | -1412 |
| 23 | -315 |
| 24 | -70 |
| 25 | -16 |
| 26 | -6 |
| 27 | 1 |
| 28 | -110410 |
| 29 | -16324 |
| 30 | -3243 |
| 31 | -635 |
| 32 | -116 |
| 33 | -22 |
| 34 | -7 |
| 35 | 1 |
| 36 | -1708394 |
| 37 | -220820 |
| 38 | -40167 |
| 39 | -7264 |
| 40 | -1183 |
| 41 | -180 |
| 42 | -29 |
| 43 | -8 |
| 44 | 1 |
| 45 | -29752066 |
| 46 | -3416788 |
| 47 | -579159 |
| 48 | -99191 |
| 49 | -15065 |
| 50 | -2049 |
| 51 | -265 |
| 52 | -37 |
| 53 | -9 |
| 54 | 1 |