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) |
|---|---|
| 1 | 1 |
| 2 | -64 |
| 3 | 0 |
| 4 | 4096 |
| 5 | 23506 |
| 6 | 0 |
| 7 | 0 |
| 8 | -262144 |
| 9 | 531441 |
| 10 | -1504384 |
| 11 | 0 |
| 12 | 0 |
| 13 | 6911282 |
| 14 | 0 |
| 15 | 0 |
| 16 | 16777216 |
| 17 | -47295038 |
| 18 | -34012224 |
| 19 | 0 |
| 20 | 96280576 |
| 21 | 0 |
| 22 | 0 |
| 23 | 0 |
| 24 | 0 |
| 25 | 308391411 |
| 26 | -442322048 |
| 27 | 0 |
| 28 | 0 |
| 29 | -173439758 |
| 30 | 0 |
| 31 | 0 |
| 32 | -1073741824 |
| 33 | 0 |
| 34 | 3026882432 |
| 35 | 0 |
| 36 | 2176782336 |
| 37 | -2050092718 |
| 38 | 0 |
| 39 | 0 |
| 40 | -6161956864 |