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 | 81 |
| 4 | 729 |
| 5 | 631881 |
| 6 | 5427972729 |
| 7 | 45361863816318631881 |
| 8 | 36452754972542772954279725427972729 |
| 9 | 2754364518634536816318453618636318814536186381631845361863816318631881 |