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 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 47 |
| 5 | 243 |
| 6 | 719 |
| 7 | 1439 |
| 8 | 2879 |
| 9 | 19683 |
| 10 | 59049 |
| 11 | 177147 |
| 12 | 531441 |
| 13 | 1594323 |
| 14 | 4782969 |