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 | 7 |
| 2 | 71 |
| 3 | 911 |
| 4 | 8111 |
| 5 | 16111 |
| 6 | 911111 |
| 7 | 1171111 |
| 8 | 71111111 |
| 9 | 131111111 |
| 10 | 1711111111 |
| 11 | 31111111111 |
| 12 | 311111111111 |
| 13 | 5111111111111 |
| 14 | 41111111111111 |
| 15 | 111151111111111 |
| 16 | 5111111111111111 |
| 17 | 11111611111111111 |
| 18 | 191111111111111111 |
| 19 | 2111111111111111111 |
| 20 | 11111111611111111111 |