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 | 9 |
| 1 | 109 |
| 2 | 1209 |
| 3 | 13309 |
| 4 | 146409 |
| 5 | 1610509 |
| 6 | 17715609 |
| 7 | 194871709 |
| 8 | 2143588809 |
| 9 | 23579476909 |
| 10 | 259374246009 |
| 11 | 2853116706109 |
| 12 | 31384283767209 |
| 13 | 345227121439309 |
| 14 | 3797498335832409 |
| 15 | 41772481694156509 |
| 16 | 459497298635721609 |
| 17 | 5054470284992937709 |