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 | 5 |
| 2 | 55 |
| 3 | 575 |
| 4 | 5775 |
| 5 | 57775 |
| 6 | 577775 |
| 7 | 5772775 |
| 8 | 57722775 |
| 9 | 577212775 |
| 10 | 5772112775 |
| 11 | 57721512775 |
| 12 | 577215512775 |
| 13 | 5772156512775 |
| 14 | 57721566512775 |
| 15 | 577215666512775 |
| 16 | 5772156666512775 |
| 17 | 57721566466512775 |
| 18 | 577215664466512775 |