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 | 15 |
| 2 | 55 |
| 3 | 6555 |
| 4 | 2235555 |
| 5 | 717655555 |
| 6 | 13140555555 |
| 7 | 9206385555555 |
| 8 | 1551745755555555 |
| 9 | 103835341555555555 |
| 10 | 26427628585555555555 |
| 11 | 2262637355455555555555 |
| 12 | 8808604932555555555555 |
| 13 | 4704913988655555555555555 |
| 14 | 4704913988655555555555555 |
| 15 | 19391196055786555555555555555 |