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 | 289 |
| 3 | 29929 |
| 4 | 8898289 |
| 5 | 88998998929 |
| 6 | 2999882888289 |
| 7 | 29292889289882992929 |
| 8 | 99299899998229989289 |
| 9 | 29222988989999289998222889 |
| 10 | 299988829289888292222928892882898892999989922922289 |