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 | -1 |
| 3 | 3 |
| 4 | -4 |
| 5 | 1 |
| 6 | 27 |
| 7 | -39 |
| 8 | 13 |
| 9 | -1 |
| 10 | 729 |
| 11 | -1080 |
| 12 | 390 |
| 13 | -40 |
| 14 | 1 |
| 15 | 59049 |
| 16 | -88209 |
| 17 | 32670 |
| 18 | -3630 |
| 19 | 121 |
| 20 | -1 |
| 21 | 14348907 |
| 22 | -21493836 |
| 23 | 8027019 |
| 24 | -914760 |
| 25 | 33033 |
| 26 | -364 |
| 27 | 1 |
| 28 | 10460353203 |
| 29 | -15683355351 |
| 30 | 5873190687 |
| 31 | -674887059 |
| 32 | 24995817 |
| 33 | -298389 |
| 34 | 1093 |