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 | 0 |
| 2 | 77 |
| 3 | 679 |
| 4 | 6788 |
| 5 | 68889 |
| 6 | 168889 |
| 7 | 2677889 |
| 8 | 26888999 |
| 9 | 126888999 |
| 10 | 3778888999 |
| 11 | 13778888999 |
| 12 | 113778888999 |
| 13 | 1113778888999 |
| 14 | 11113778888999 |
| 15 | 277777788888899 |
| 16 | 1277777788888899 |
| 17 | 11277777788888899 |
| 18 | 111277777788888899 |