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 | 7 |
| 1 | 979 |
| 2 | 99799 |
| 3 | 9997999 |
| 4 | 999979999 |
| 5 | 99999799999 |
| 6 | 9999997999999 |
| 7 | 999999979999999 |
| 8 | 99999999799999999 |
| 9 | 9999999997999999999 |
| 10 | 999999999979999999999 |
| 11 | 99999999999799999999999 |
| 12 | 9999999999997999999999999 |
| 13 | 999999999999979999999999999 |
| 14 | 99999999999999799999999999999 |
| 15 | 9999999999999997999999999999999 |