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 | 7 |
| 2 | 929 |
| 3 | 98689 |
| 4 | 9989899 |
| 5 | 999727999 |
| 6 | 99999199999 |
| 7 | 9999987899999 |
| 8 | 999999787999999 |
| 9 | 99999999299999999 |
| 10 | 9999999992999999999 |
| 11 | 999999999757999999999 |
| 12 | 99999999997579999999999 |