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 | 6 |
| 2 | 91 |
| 3 | 990 |
| 4 | 9870 |
| 5 | 99681 |
| 6 | 998991 |
| 7 | 9997156 |
| 8 | 99991011 |
| 9 | 999961560 |
| 10 | 9999878910 |
| 11 | 99999957291 |
| 12 | 999999911791 |
| 13 | 9999997965180 |
| 14 | 99999998250180 |
| 15 | 999999997764120 |
| 16 | 9999999895728690 |
| 17 | 99999999552805215 |
| 18 | 999999998765257141 |