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 | 1 |
| 3 | 9 |
| 4 | 16 |
| 5 | 81 |
| 6 | 784 |
| 7 | 6561 |
| 8 | 18496 |
| 9 | 1478656 |
| 10 | 43046721 |
| 11 | 281165824 |
| 12 | 893352321 |
| 13 | 5859137025 |
| 14 | 41368305664 |
| 15 | 405026597889 |
| 16 | 1088266240000 |
| 17 | 15965210931201 |
| 18 | 36991307874304 |
| 19 | 583272781383681 |
| 20 | 1318789102698496 |