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 | 4 |
| 1 | -1 |
| 2 | -2 |
| 3 | -4 |
| 4 | -8 |
| 5 | -16 |
| 6 | -32 |
| 7 | -64 |
| 8 | -128 |
| 9 | -256 |
| 10 | -512 |
| 11 | -1024 |
| 12 | -2048 |
| 13 | -4096 |
| 14 | -8192 |
| 15 | -16384 |
| 16 | -32768 |
| 17 | -65536 |