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 | -4 |
| 2 | 0 |
| 3 | 16 |
| 4 | -16 |
| 5 | 8 |
| 6 | 0 |
| 7 | -96 |
| 8 | 112 |
| 9 | 44 |
| 10 | 0 |
| 11 | 176 |
| 12 | -448 |
| 13 | -88 |
| 14 | 0 |
| 15 | -32 |
| 16 | 1136 |
| 17 | -200 |
| 18 | 0 |
| 19 | -176 |
| 20 | -2016 |
| 21 | 384 |
| 22 | 0 |
| 23 | 224 |
| 24 | 3136 |
| 25 | 484 |
| 26 | 0 |
| 27 | -608 |
| 28 | -5504 |
| 29 | -792 |
| 30 | 0 |
| 31 | 640 |
| 32 | 9328 |
| 33 | -704 |
| 34 | 0 |
| 35 | 192 |
| 36 | -12112 |
| 37 | 648 |
| 38 | 0 |
| 39 | 352 |
| 40 | 14112 |
| 41 | 792 |
| 42 | 0 |
| 43 | -208 |
| 44 | -21312 |
| 45 | -88 |
| 46 | 0 |
| 47 | -2112 |
| 48 | 31808 |
| 49 | -932 |
| 50 | 0 |
| 51 | 800 |