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 | 11881 |
| 5 | 19881 |
| 6 | 111999889 |
| 7 | 1199998881 |
| 8 | 1981191998999889 |
| 9 | 11181188899981881 |
| 10 | 889111189818189198888889 |
| 11 | 18891818199881191889889889 |
| 12 | 8819999189981919818818919999881 |