A008715 18 in base 18-n.
10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 30, 33, 102, 200, 10010, 111111111111111111
Offset: 0
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.