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 | 0 |
| 2 | 11 |
| 3 | 181 |
| 4 | 1181 |
| 5 | 18181 |
| 6 | 0 |
| 7 | 1111181 |
| 8 | 11818181 |
| 9 | 111111181 |
| 10 | 1111111181 |
| 11 | 11111188811 |
| 12 | 0 |
| 13 | 1111111118111 |
| 14 | 11111111818181 |
| 15 | 111111111111881 |
| 16 | 1111111111111181 |
| 17 | 11111111111188111 |
| 18 | 0 |
| 19 | 1111111111111111111 |