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 | 27 |
| 4 | 0 |
| 5 | 3125 |
| 6 | 729 |
| 7 | 823543 |
| 8 | 0 |
| 9 | 19683 |
| 10 | 9765625 |
| 11 | 285311670611 |
| 12 | 0 |
| 13 | 302875106592253 |
| 14 | 678223072849 |
| 15 | 437893890380859375 |
| 16 | 0 |
| 17 | 827240261886336764177 |
| 18 | 387420489 |
| 19 | 1978419655660313589123979 |
| 20 | 0 |