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 | 11 |
| 2 | 101 |
| 3 | 131 |
| 4 | 151 |
| 5 | 181 |
| 6 | 191 |
| 7 | 13331 |
| 8 | 15551 |
| 9 | 16661 |
| 10 | 19991 |
| 11 | 1333331 |
| 12 | 1444441 |
| 13 | 1777771 |
| 14 | 188888881 |
| 15 | 199999991 |
| 16 | 1666666666661 |
| 17 | 188888888888881 |
| 18 | 16666666666666661 |
| 19 | 1111111111111111111 |
| 20 | 1666666666666666661 |
| 21 | 155555555555555555551 |
| 22 | 11111111111111111111111 |