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 | 2 |
| 3 | 1 |
| 4 | -4 |
| 5 | 4 |
| 6 | -1 |
| 7 | 6 |
| 8 | -12 |
| 9 | 8 |
| 10 | 1 |
| 11 | -8 |
| 12 | 24 |
| 13 | -32 |
| 14 | 16 |
| 15 | -1 |
| 16 | 10 |
| 17 | -40 |
| 18 | 80 |
| 19 | -80 |
| 20 | 32 |
| 21 | 1 |
| 22 | -12 |
| 23 | 60 |
| 24 | -160 |
| 25 | 240 |
| 26 | -192 |
| 27 | 64 |
| 28 | -1 |
| 29 | 14 |
| 30 | -84 |
| 31 | 280 |
| 32 | -560 |
| 33 | 672 |
| 34 | -448 |
| 35 | 128 |
| 36 | 1 |
| 37 | -16 |
| 38 | 112 |
| 39 | -448 |
| 40 | 1120 |
| 41 | -1792 |
| 42 | 1792 |
| 43 | -1024 |
| 44 | 256 |
| 45 | -1 |
| 46 | 18 |
| 47 | -144 |
| 48 | 672 |
| 49 | -2016 |
| 50 | 4032 |
| 51 | -5376 |
| 52 | 4608 |
| 53 | -2304 |
| 54 | 512 |