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 | 0 |
| 4 | -1 |
| 5 | -1 |
| 6 | -1 |
| 7 | 1 |
| 8 | 2 |
| 9 | 2 |
| 10 | 1 |
| 11 | -2 |
| 12 | -4 |
| 13 | -5 |
| 14 | -2 |
| 15 | 4 |
| 16 | 9 |
| 17 | 11 |
| 18 | 4 |
| 19 | -8 |
| 20 | -20 |
| 21 | -22 |
| 22 | -7 |
| 23 | 18 |
| 24 | 42 |
| 25 | 43 |
| 26 | 12 |
| 27 | -42 |
| 28 | -89 |
| 29 | -87 |
| 30 | -19 |
| 31 | 96 |
| 32 | 189 |
| 33 | 179 |
| 34 | 28 |
| 35 | -214 |
| 36 | -399 |
| 37 | -363 |
| 38 | -32 |
| 39 | 472 |
| 40 | 838 |
| 41 | 727 |
| 42 | 6 |
| 43 | -1041 |
| 44 | -1760 |
| 45 | -1452 |
| 46 | 112 |
| 47 | 2291 |
| 48 | 3696 |
| 49 | 2895 |
| 50 | -487 |
| 51 | -5015 |
| 52 | -7735 |
| 53 | -5740 |
| 54 | 1551 |
| 55 | 10929 |
| 56 | 16135 |
| 57 | 11298 |
| 58 | -4377 |
| 59 | -23741 |
| 60 | -33587 |