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 | 3 |
| 2 | -1 |
| 3 | 2 |
| 4 | -9 |
| 5 | 1 |
| 6 | 1 |
| 7 | -9 |
| 8 | 18 |
| 9 | -1 |
| 10 | 0 |
| 11 | -5 |
| 12 | 25 |
| 13 | -30 |
| 14 | 1 |
| 15 | -1 |
| 16 | 3 |
| 17 | 14 |
| 18 | -55 |
| 19 | 45 |
| 20 | -1 |
| 21 | -2 |
| 22 | 15 |
| 23 | -27 |
| 24 | -28 |
| 25 | 105 |
| 26 | -63 |
| 27 | 1 |
| 28 | -3 |
| 29 | 31 |
| 30 | -110 |
| 31 | 135 |
| 32 | 42 |
| 33 | -182 |
| 34 | 84 |
| 35 | -1 |
| 36 | -4 |
| 37 | 51 |
| 38 | -247 |
| 39 | 550 |
| 40 | -495 |
| 41 | -42 |
| 42 | 294 |
| 43 | -108 |
| 44 | 1 |
| 45 | -5 |
| 46 | 75 |
| 47 | -450 |
| 48 | 1365 |
| 49 | -2145 |
| 50 | 1485 |
| 51 | 0 |
| 52 | -450 |
| 53 | 135 |
| 54 | -1 |
| 55 | -6 |
| 56 | 103 |