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 | 1 |
| 4 | 1 |
| 5 | 9 |
| 6 | 9 |
| 7 | 1 |
| 8 | 1 |
| 9 | 121 |
| 10 | 1089 |
| 11 | 729 |
| 12 | 729 |
| 13 | 1521 |
| 14 | 169 |
| 15 | 1 |
| 16 | 1 |
| 17 | 2601 |
| 18 | 314721 |
| 19 | 1771561 |
| 20 | 15944049 |