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 | 3 |
| 1 | 27 |
| 2 | 19683 |
| 3 | 7625597484987 |
| 4 | 443426488243037769948249630619149892803 |