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 | 9 |
| 2 | 81 |
| 3 | 6561 |
| 4 | 43046721 |
| 5 | 1853020188851841 |
| 6 | 3433683820292512484657849089281 |
| 7 | 11790184577738583171520872861412518665678211592275841109096961 |