A099085 A bisection of A006966.
1, 1, 2, 15, 222, 5994, 262776, 16873364, 1471613387, 165269824761
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.