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 | 2 |
| 2 | 13 |
| 3 | 17 |
| 4 | 19 |
| 5 | 59 |
| 6 | 79 |
| 7 | 389 |
| 8 | 499 |
| 9 | 1889 |
| 10 | 1999 |
| 11 | 6899 |
| 12 | 17989 |
| 13 | 39989 |
| 14 | 49999 |
| 15 | 98999 |
| 16 | 199999 |
| 17 | 599999 |
| 18 | 799999 |
| 19 | 2999999 |
| 20 | 4999999 |
| 21 | 9899999 |
| 22 | 19999999 |
| 23 | 59999999 |
| 24 | 189997999 |
| 25 | 389999999 |
| 26 | 689899999 |
| 27 | 998999999 |
| 28 | 2999899999 |
| 29 | 6999999989 |
| 30 | 9899989999 |
| 31 | 39899999999 |
| 32 | 68899999999 |
| 33 | 98999999999 |