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 | 1 |
| 2 | 11 |
| 3 | 101 |
| 4 | 1111 |
| 5 | 11111 |
| 6 | 101101 |
| 7 | 1110111 |
| 8 | 11100111 |
| 9 | 101000101 |
| 10 | 1111001111 |
| 11 | 11111011111 |
| 12 | 101101101101 |
| 13 | 1111111111111 |
| 14 | 11111111111111 |
| 15 | 101101101101101 |
| 16 | 1110111111110111 |
| 17 | 11100111111100111 |
| 18 | 101000101101000101 |
| 19 | 1111001110111001111 |
| 20 | 11111011100111011111 |
| 21 | 101101101000101101101 |