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 | 0 |
| 2 | 1 |
| 3 | -2 |
| 4 | 5 |
| 5 | -4 |
| 6 | 4 |
| 7 | -6 |
| 8 | 17 |
| 9 | -14 |
| 10 | 6 |
| 11 | -10 |
| 12 | 28 |
| 13 | -12 |
| 14 | 8 |
| 15 | -36 |
| 16 | 49 |
| 17 | -16 |
| 18 | 13 |
| 19 | -18 |
| 20 | 46 |
| 21 | -52 |
| 22 | 12 |
| 23 | -22 |
| 24 | 100 |
| 25 | -44 |
| 26 | 14 |
| 27 | -68 |
| 28 | 64 |
| 29 | -28 |
| 30 | 24 |
| 31 | -30 |
| 32 | 129 |
| 33 | -84 |
| 34 | 18 |
| 35 | -92 |
| 36 | 121 |
| 37 | -36 |
| 38 | 20 |
| 39 | -100 |
| 40 | 166 |
| 41 | -40 |
| 42 | 32 |
| 43 | -42 |
| 44 | 100 |
| 45 | -192 |
| 46 | 24 |
| 47 | -46 |
| 48 | 292 |
| 49 | -90 |
| 50 | 31 |
| 51 | -132 |
| 52 | 118 |
| 53 | -52 |
| 54 | 40 |
| 55 | -148 |
| 56 | 232 |
| 57 | -148 |
| 58 | 30 |
| 59 | -58 |
| 60 | 264 |