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 | 0 |
| 1 | 101 |
| 2 | 1010 |
| 3 | 1111 |
| 4 | 10100 |
| 5 | 10101 |
| 6 | 11110 |
| 7 | 11111 |
| 8 | 101000 |
| 9 | 101010 |
| 10 | 101101 |
| 11 | 101111 |
| 12 | 111100 |
| 13 | 111101 |
| 14 | 111110 |
| 15 | 111111 |
| 16 | 1010000 |
| 17 | 1010100 |
| 18 | 1010101 |
| 19 | 1011010 |
| 20 | 1011110 |
| 21 | 1011111 |
| 22 | 1111000 |
| 23 | 1111010 |
| 24 | 1111100 |
| 25 | 1111101 |
| 26 | 1111110 |
| 27 | 1111111 |
| 28 | 10100000 |