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 | 0 |
| 2 | 81 |
| 3 | 729 |
| 4 | 6561 |
| 5 | 59049 |
| 6 | 531441 |
| 7 | 4782969 |
| 8 | 43046721 |
| 9 | 0 |
| 10 | 486784401 |
| 11 | 727739626 |
| 12 | 3801397473 |
| 13 | 7390478182 |
| 14 | 5013665073 |
| 15 | 26942641524 |
| 16 | 68218142337 |
| 17 | 50040016962 |
| 18 | 127461340881 |
| 19 | 20157955560 |
| 20 | 179056928801 |
| 21 | 95734214766 |
| 22 | 798384194161 |
| 23 | 812529625653 |
| 24 | 123794634177 |
| 25 | 1880664942124 |