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 | 1111111111 |
| 2 | 10111111111 |
| 3 | 11011111111 |
| 4 | 11101111111 |
| 5 | 11110111111 |
| 6 | 11111011111 |
| 7 | 11111101111 |
| 8 | 11111110111 |
| 9 | 11111111011 |
| 10 | 11111111101 |
| 11 | 11111111110 |
| 12 | 100111111111 |
| 13 | 101011111111 |
| 14 | 101101111111 |
| 15 | 101110111111 |
| 16 | 101111011111 |
| 17 | 101111101111 |
| 18 | 101111110111 |
| 19 | 101111111011 |
| 20 | 101111111101 |