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 | -1 |
| 5 | 1 |
| 6 | 2 |
| 7 | -6 |
| 8 | -1 |
| 9 | 5 |
| 10 | 1 |
| 11 | 0 |
| 12 | 2 |
| 13 | -8 |
| 14 | -6 |
| 15 | 22 |
| 16 | -1 |
| 17 | -11 |
| 18 | 5 |
| 19 | -30 |
| 20 | 1 |
| 21 | 33 |
| 22 | 0 |
| 23 | 0 |
| 24 | 2 |
| 25 | -16 |
| 26 | -8 |
| 27 | 52 |
| 28 | -6 |
| 29 | -40 |
| 30 | 22 |
| 31 | -114 |
| 32 | -1 |
| 33 | 125 |
| 34 | -11 |
| 35 | 90 |
| 36 | 5 |
| 37 | -149 |
| 38 | -30 |
| 39 | 154 |
| 40 | 1 |
| 41 | -123 |
| 42 | 33 |
| 43 | -360 |
| 44 | 0 |
| 45 | 552 |
| 46 | 0 |
| 47 | 144 |
| 48 | 2 |
| 49 | -440 |
| 50 | -16 |
| 51 | 256 |
| 52 | -8 |
| 53 | -360 |
| 54 | 52 |
| 55 | -552 |
| 56 | -6 |
| 57 | 1176 |
| 58 | -40 |
| 59 | 576 |
| 60 | 22 |
| 61 | -1360 |
| 62 | -114 |
| 63 | 470 |
| 64 | -1 |
| 65 | -235 |
| 66 | 125 |
| 67 | -1710 |
| 68 | -11 |
| 69 | 3387 |
| 70 | 90 |
| 71 | 486 |
| 72 | 5 |
| 73 | -3353 |
| 74 | -149 |
| 75 | 1864 |
| 76 | -30 |
| 77 | -2152 |
| 78 | 154 |
| 79 | -2250 |
| 80 | 1 |