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 | -4 |
| 2 | 1 |
| 3 | -2 |
| 4 | 1 |
| 5 | -1 |
| 6 | 1 |
| 7 | 2 |
| 8 | -4 |
| 9 | 1 |
| 10 | 1 |
| 11 | -3 |
| 12 | 1 |
| 13 | 1 |
| 14 | -4 |
| 15 | 1 |
| 16 | -1 |
| 17 | 6 |
| 18 | -5 |
| 19 | 1 |
| 20 | 2 |
| 21 | -16 |
| 22 | 20 |
| 23 | -8 |
| 24 | 1 |
| 25 | -1 |
| 26 | 9 |
| 27 | -6 |
| 28 | 1 |
| 29 | 1 |
| 30 | -12 |
| 31 | 19 |
| 32 | -8 |
| 33 | 1 |
| 34 | -1 |
| 35 | 15 |
| 36 | -35 |
| 37 | 28 |
| 38 | -9 |
| 39 | 1 |
| 40 | 1 |
| 41 | -16 |
| 42 | 20 |
| 43 | -8 |
| 44 | 1 |
| 45 | 1 |
| 46 | -21 |
| 47 | 70 |
| 48 | -84 |
| 49 | 45 |
| 50 | -11 |
| 51 | 1 |
| 52 | 1 |
| 53 | -24 |
| 54 | 86 |
| 55 | -104 |
| 56 | 53 |
| 57 | -12 |
| 58 | 1 |
| 59 | 1 |
| 60 | -24 |
| 61 | 26 |
| 62 | -9 |
| 63 | 1 |
| 64 | 2 |
| 65 | -64 |
| 66 | 336 |
| 67 | -672 |
| 68 | 660 |
| 69 | -352 |
| 70 | 104 |
| 71 | -16 |
| 72 | 1 |
| 73 | 1 |
| 74 | -36 |
| 75 | 210 |
| 76 | -462 |
| 77 | 495 |
| 78 | -286 |
| 79 | 91 |
| 80 | -15 |
| 81 | 1 |