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 | 0 |
| 6 | -1 |
| 7 | -1 |
| 8 | 2 |
| 9 | 1 |
| 10 | -2 |
| 11 | -1 |
| 12 | 2 |
| 13 | 1 |
| 14 | -3 |
| 15 | -1 |
| 16 | 4 |
| 17 | 2 |
| 18 | -5 |
| 19 | -2 |
| 20 | 5 |
| 21 | 2 |
| 22 | -6 |
| 23 | -3 |
| 24 | 8 |
| 25 | 4 |
| 26 | -9 |
| 27 | -4 |
| 28 | 10 |
| 29 | 4 |
| 30 | -12 |
| 31 | -6 |
| 32 | 15 |
| 33 | 7 |
| 34 | -17 |
| 35 | -7 |
| 36 | 19 |
| 37 | 8 |
| 38 | -22 |
| 39 | -10 |
| 40 | 26 |
| 41 | 12 |
| 42 | -30 |
| 43 | -13 |
| 44 | 33 |
| 45 | 14 |
| 46 | -38 |
| 47 | -17 |
| 48 | 45 |
| 49 | 21 |
| 50 | -51 |
| 51 | -22 |
| 52 | 56 |
| 53 | 24 |
| 54 | -64 |
| 55 | -29 |
| 56 | 74 |
| 57 | 33 |
| 58 | -83 |
| 59 | -36 |
| 60 | 92 |
| 61 | 40 |
| 62 | -104 |
| 63 | -46 |
| 64 | 119 |
| 65 | 53 |
| 66 | -133 |
| 67 | -58 |
| 68 | 147 |
| 69 | 63 |
| 70 | -165 |
| 71 | -73 |
| 72 | 187 |
| 73 | 83 |
| 74 | -208 |
| 75 | -90 |
| 76 | 229 |
| 77 | 99 |
| 78 | -256 |