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 | 3 |
| 4 | -2 |
| 5 | -4 |
| 6 | 8 |
| 7 | 0 |
| 8 | -16 |
| 9 | 16 |
| 10 | 16 |
| 11 | -48 |
| 12 | 16 |
| 13 | 80 |
| 14 | -112 |
| 15 | -48 |
| 16 | 272 |
| 17 | -176 |
| 18 | -368 |
| 19 | 720 |
| 20 | 16 |
| 21 | -1456 |
| 22 | 1424 |
| 23 | 1488 |
| 24 | -4336 |
| 25 | 1360 |
| 26 | 7312 |
| 27 | -10032 |
| 28 | -4592 |
| 29 | 24656 |
| 30 | -15472 |
| 31 | -33840 |
| 32 | 64784 |
| 33 | 2896 |
| 34 | -132464 |
| 35 | 126672 |
| 36 | 138256 |
| 37 | -391600 |
| 38 | 115088 |
| 39 | 668112 |
| 40 | -898288 |
| 41 | -437936 |
| 42 | 2234512 |