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 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | -8 |
| 4 | -4 |
| 5 | 16 |
| 6 | 16 |
| 7 | -48 |
| 8 | -96 |
| 9 | 64 |
| 10 | 320 |
| 11 | 0 |
| 12 | -1024 |
| 13 | -768 |
| 14 | 2560 |
| 15 | 4096 |
| 16 | -5120 |
| 17 | -16384 |
| 18 | 4096 |
| 19 | 53248 |
| 20 | 24576 |
| 21 | -147456 |
| 22 | -180224 |
| 23 | 327680 |
| 24 | 786432 |
| 25 | -458752 |
| 26 | -2752512 |
| 27 | -524288 |
| 28 | 8126464 |
| 29 | 7340032 |
| 30 | -19922944 |
| 31 | -36700160 |
| 32 | 35651584 |