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 | 2 |
| 1 | 13 |
| 2 | 11 |
| 3 | 1117 |
| 4 | 10111 |
| 5 | 101111 |
| 6 | 1111151 |
| 7 | 11110111 |
| 8 | 101111111 |
| 9 | 1111111121 |
| 10 | 11111111113 |
| 11 | 101111111111 |
| 12 | 1111111118111 |
| 13 | 11111111111411 |
| 14 | 111111111116111 |
| 15 | 1111111111111181 |
| 16 | 11111111101111111 |
| 17 | 101111111111111111 |
| 18 | 1111111111111111171 |
| 19 | 1111111111111111111 |
| 20 | 111111111111111119111 |