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 | 0 |
| 2 | 4 |
| 3 | 2 |
| 4 | -2 |
| 5 | 32 |
| 6 | 10 |
| 7 | -34 |
| 8 | 256 |
| 9 | 26 |
| 10 | 1024 |
| 11 | 590 |
| 12 | -278 |
| 13 | 8192 |
| 14 | 3262 |
| 15 | -6598 |
| 16 | 65536 |
| 17 | 12974 |
| 18 | 262144 |
| 19 | 169994 |
| 20 | -14306 |
| 21 | 2097152 |
| 22 | 1005658 |
| 23 | -1177330 |
| 24 | 16777216 |
| 25 | 4856618 |
| 26 | -18984578 |
| 27 | 134217728 |
| 28 | 10155130 |
| 29 | 536870912 |
| 30 | 298900846 |
| 31 | -177039286 |
| 32 | 4294967296 |
| 33 | 1616365790 |
| 34 | -3740837222 |