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 | -1 |
| 3 | 1 |
| 4 | -2 |
| 5 | 1 |
| 6 | 0 |
| 7 | -2 |
| 8 | 3 |
| 9 | -1 |
| 10 | -4 |
| 11 | 8 |
| 12 | 0 |
| 13 | -4 |
| 14 | 1 |
| 15 | -16 |
| 16 | 56 |
| 17 | -56 |
| 18 | 10 |
| 19 | 5 |
| 20 | -1 |
| 21 | -48 |
| 22 | 224 |
| 23 | -360 |
| 24 | 224 |
| 25 | -35 |
| 26 | -6 |
| 27 | 1 |
| 28 | -128 |
| 29 | 736 |
| 30 | -1584 |
| 31 | 1560 |
| 32 | -672 |
| 33 | 84 |
| 34 | 7 |
| 35 | -1 |
| 36 | -320 |
| 37 | 2176 |
| 38 | -5824 |
| 39 | 7744 |
| 40 | -5280 |
| 41 | 1680 |
| 42 | -168 |
| 43 | -8 |
| 44 | 1 |
| 45 | -768 |
| 46 | 6016 |
| 47 | -19200 |
| 48 | 32032 |
| 49 | -29744 |