A000858 Duplicate of A003436.
0, 1, 4, 31, 293, 3326, 44189, 673471, 11588884, 222304897, 4704612119
Offset: 1
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.