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 | 4 |
| 3 | -4 |
| 4 | 0 |
| 5 | 16 |
| 6 | -48 |
| 7 | 96 |
| 8 | -128 |
| 9 | 64 |
| 10 | 256 |
| 11 | -1024 |
| 12 | 2304 |
| 13 | -3584 |
| 14 | 3072 |
| 15 | 3072 |
| 16 | -20480 |
| 17 | 53248 |
| 18 | -94208 |
| 19 | 106496 |
| 20 | 0 |
| 21 | -376832 |
| 22 | 1179648 |
| 23 | -2359296 |
| 24 | 3211264 |
| 25 | -1703936 |
| 26 | -6029312 |
| 27 | 24903680 |
| 28 | -56623104 |
| 29 | 89128960 |
| 30 | -78643200 |
| 31 | -69206016 |
| 32 | 494927872 |
| 33 | -1304428544 |
| 34 | 2332033024 |
| 35 | -2684354560 |