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 | 11 |
| 2 | 101 |
| 3 | 1010 |
| 4 | 10010 |
| 5 | 100100 |
| 6 | 1000100 |
| 7 | 10001000 |
| 8 | 100001000 |
| 9 | 1000010000 |
| 10 | 10000010000 |
| 11 | 100000100000 |
| 12 | 1000000100000 |
| 13 | 10000001000000 |
| 14 | 100000001000000 |
| 15 | 1000000010000000 |
| 16 | 10000000010000000 |
| 17 | 100000000100000000 |
| 18 | 1000000000100000000 |
| 19 | 10000000001000000000 |