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 | 9 |
| 3 | 27 |
| 4 | 81 |
| 5 | 729 |
| 6 | 2187 |
| 7 | 6561 |
| 8 | 59049 |
| 9 | 177147 |
| 10 | 4782969 |
| 11 | 1162261467 |
| 12 | 7625597484987 |
| 13 | 22876792454961 |
| 14 | 16677181699666569 |
| 15 | 12157665459056928801 |
| 16 | 717897987691852588770249 |
| 17 | 174449211009120179071170507 |
| 18 | 11972515182562019788602740026717047105681 |