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 | -1 |
| 3 | -7 |
| 4 | -3 |
| 5 | 1 |
| 6 | 33 |
| 7 | 39 |
| 8 | 6 |
| 9 | -1 |
| 10 | -135 |
| 11 | -255 |
| 12 | -125 |
| 13 | -10 |
| 14 | 1 |
| 15 | 513 |
| 16 | 1323 |
| 17 | 1092 |
| 18 | 305 |
| 19 | 15 |
| 20 | -1 |
| 21 | -1863 |
| 22 | -6075 |
| 23 | -7047 |
| 24 | -3444 |
| 25 | -630 |
| 26 | -21 |
| 27 | 1 |
| 28 | 6561 |
| 29 | 25839 |
| 30 | 38610 |
| 31 | 27135 |
| 32 | 8946 |
| 33 | 1162 |
| 34 | 28 |
| 35 | -1 |
| 36 | -22599 |
| 37 | -104247 |
| 38 | -190593 |
| 39 | -175230 |