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 | 67 |
| 3 | 967 |
| 4 | 3967 |
| 5 | 93967 |
| 6 | 693967 |
| 7 | 7693967 |
| 8 | 87693967 |
| 9 | 687693967 |
| 10 | 1687693967 |
| 11 | 91687693967 |
| 12 | 991687693967 |
| 13 | 3991687693967 |