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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 0 |
| 5 | -4 |
| 6 | 0 |
| 7 | 16 |
| 8 | 16 |
| 9 | -32 |
| 10 | -64 |
| 11 | 64 |
| 12 | 256 |
| 13 | 0 |
| 14 | -768 |
| 15 | -512 |
| 16 | 2048 |
| 17 | 3072 |
| 18 | -4096 |
| 19 | -12288 |
| 20 | 4096 |
| 21 | 40960 |
| 22 | 16384 |
| 23 | -114688 |
| 24 | -131072 |
| 25 | 262144 |
| 26 | 589824 |
| 27 | -393216 |
| 28 | -2097152 |
| 29 | -262144 |
| 30 | 6291456 |
| 31 | 5242880 |
| 32 | -15728640 |
| 33 | -27262976 |
| 34 | 29360128 |
| 35 | 104857600 |
| 36 | -16777216 |