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 | 6 |
| 3 | -4 |
| 4 | -4 |
| 5 | 16 |
| 6 | -24 |
| 7 | 16 |
| 8 | 16 |
| 9 | -64 |
| 10 | 96 |
| 11 | -64 |
| 12 | -64 |
| 13 | 256 |
| 14 | -384 |
| 15 | 256 |
| 16 | 256 |
| 17 | -1024 |
| 18 | 1536 |
| 19 | -1024 |
| 20 | -1024 |
| 21 | 4096 |
| 22 | -6144 |
| 23 | 4096 |
| 24 | 4096 |
| 25 | -16384 |
| 26 | 24576 |
| 27 | -16384 |
| 28 | -16384 |
| 29 | 65536 |
| 30 | -98304 |
| 31 | 65536 |
| 32 | 65536 |
| 33 | -262144 |
| 34 | 393216 |
| 35 | -262144 |
| 36 | -262144 |
| 37 | 1048576 |
| 38 | -1572864 |
| 39 | 1048576 |
| 40 | 1048576 |
| 41 | -4194304 |
| 42 | 6291456 |