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 | 1 |
| 1 | 10 |
| 2 | 101 |
| 3 | 1011 |
| 4 | 10111 |
| 5 | 101111 |
| 6 | 1011111 |
| 7 | 10111111 |
| 8 | 101111111 |
| 9 | 1011111111 |
| 10 | 10111111111 |
| 11 | 101111111111 |
| 12 | 1011111111111 |
| 13 | 10111111111111 |
| 14 | 101111111111111 |
| 15 | 1011111111111111 |
| 16 | 10111111111111111 |
| 17 | 101111111111111111 |
| 18 | 1011111111111111111 |
| 19 | 10111111111111111111 |