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 | -1 |
| 2 | -2 |
| 3 | -2 |
| 4 | -4 |
| 5 | 0 |
| 6 | -8 |
| 7 | 16 |
| 8 | 0 |
| 9 | 64 |
| 10 | 64 |
| 11 | 384 |
| 12 | 0 |
| 13 | 1536 |
| 14 | 1024 |
| 15 | 3072 |
| 16 | 2048 |
| 17 | 16384 |
| 18 | -8192 |
| 19 | 49152 |
| 20 | -32768 |
| 21 | 32768 |
| 22 | -65536 |
| 23 | 262144 |
| 24 | -1835008 |
| 25 | 524288 |
| 26 | -3145728 |
| 27 | -6291456 |
| 28 | -18874368 |
| 29 | -4194304 |
| 30 | -117440512 |
| 31 | -16777216 |
| 32 | -301989888 |
| 33 | -469762048 |
| 34 | -671088640 |
| 35 | -805306368 |
| 36 | -6710886400 |
| 37 | 536870912 |