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 | -2 |
| 2 | 0 |
| 3 | 4 |
| 4 | -4 |
| 5 | -4 |
| 6 | 12 |
| 7 | -4 |
| 8 | -20 |
| 9 | 28 |
| 10 | 12 |
| 11 | -68 |
| 12 | 44 |
| 13 | 92 |
| 14 | -180 |
| 15 | -4 |
| 16 | 364 |
| 17 | -356 |
| 18 | -372 |
| 19 | 1084 |
| 20 | -340 |
| 21 | -1828 |
| 22 | 2508 |
| 23 | 1148 |
| 24 | -6164 |
| 25 | 3868 |
| 26 | 8460 |
| 27 | -16196 |
| 28 | -724 |
| 29 | 33116 |
| 30 | -31668 |
| 31 | -34564 |
| 32 | 97900 |
| 33 | -28772 |
| 34 | -167028 |
| 35 | 224572 |
| 36 | 109484 |
| 37 | -558628 |
| 38 | 339660 |
| 39 | 777596 |
| 40 | -1456916 |
| 41 | -98276 |
| 42 | 3012108 |
| 43 | -2815556 |
| 44 | -3208660 |
| 45 | 8839772 |