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 | 9 |
| 2 | 99 |
| 3 | 996 |
| 4 | 9996 |
| 5 | 99990 |
| 6 | 999570 |
| 7 | 9999990 |
| 8 | 99981420 |
| 9 | 999068070 |
| 10 | 9592993410 |