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 | 0 |
| 1 | 72 |
| 2 | 792 |
| 3 | 7992 |
| 4 | 79992 |
| 5 | 799992 |
| 6 | 7999992 |
| 7 | 79999992 |
| 8 | 799999992 |
| 9 | 7999999992 |
| 10 | 79999999992 |
| 11 | 799999999992 |
| 12 | 7999999999992 |
| 13 | 79999999999992 |
| 14 | 799999999999992 |
| 15 | 7999999999999992 |
| 16 | 79999999999999992 |
| 17 | 799999999999999992 |
| 18 | 7999999999999999992 |
| 19 | 79999999999999999992 |
| 20 | 799999999999999999992 |