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 | 1 |
| 2 | 0 |
| 3 | -6 |
| 4 | 0 |
| 5 | -10 |
| 6 | -6 |
| 7 | 14 |
| 8 | 0 |
| 9 | 15 |
| 10 | -10 |
| 11 | -22 |
| 12 | 0 |
| 13 | -26 |
| 14 | 14 |
| 15 | 20 |
| 16 | 0 |
| 17 | 34 |
| 18 | 18 |
| 19 | -38 |
| 20 | -10 |
| 21 | -28 |
| 22 | -22 |
| 23 | 46 |
| 24 | 0 |
| 25 | 45 |
| 26 | -26 |
| 27 | -36 |
| 28 | 14 |
| 29 | -58 |
| 30 | 30 |
| 31 | 62 |
| 32 | 0 |
| 33 | 44 |
| 34 | 34 |
| 35 | -56 |
| 36 | 18 |
| 37 | -74 |
| 38 | -38 |
| 39 | 52 |
| 40 | 0 |
| 41 | 82 |
| 42 | -28 |
| 43 | -86 |
| 44 | -22 |
| 45 | -42 |
| 46 | 46 |
| 47 | 94 |
| 48 | 0 |
| 49 | 105 |
| 50 | 50 |
| 51 | -68 |
| 52 | -26 |
| 53 | -106 |
| 54 | -36 |
| 55 | 88 |
| 56 | 0 |
| 57 | 76 |
| 58 | -58 |
| 59 | -118 |
| 60 | 30 |
| 61 | -122 |
| 62 | 62 |
| 63 | 102 |
| 64 | 0 |
| 65 | 104 |
| 66 | 44 |
| 67 | -134 |
| 68 | 34 |
| 69 | -92 |
| 70 | -70 |
| 71 | 142 |
| 72 | 18 |
| 73 | 146 |