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 | 2 |
| 6 | -1 |
| 7 | 3 |
| 8 | -1 |
| 9 | 1 |
| 10 | 4 |
| 11 | -2 |
| 12 | -4 |
| 13 | -1 |
| 14 | 7 |
| 15 | -11 |
| 16 | 0 |
| 17 | -6 |
| 18 | 3 |
| 19 | -6 |
| 20 | 9 |
| 21 | 2 |
| 22 | -6 |
| 23 | 2 |
| 24 | 5 |
| 25 | 12 |
| 26 | -16 |
| 27 | 48 |
| 28 | 4 |
| 29 | -1 |
| 30 | -28 |
| 31 | 26 |
| 32 | -30 |
| 33 | 30 |
| 34 | -62 |
| 35 | 12 |
| 36 | 16 |
| 37 | -55 |
| 38 | -9 |
| 39 | -39 |
| 40 | 18 |
| 41 | -47 |
| 42 | 103 |
| 43 | -149 |
| 44 | 87 |
| 45 | -182 |
| 46 | 210 |
| 47 | -9 |
| 48 | 45 |
| 49 | 75 |
| 50 | 225 |
| 51 | -174 |
| 52 | 39 |
| 53 | 273 |
| 54 | 11 |
| 55 | 164 |
| 56 | -224 |
| 57 | 77 |
| 58 | -105 |
| 59 | 117 |
| 60 | -703 |
| 61 | 715 |
| 62 | -678 |