A007172 Erroneous version of A027610.
1, 1, 1, 3, 7, 24, 93, 434, 2110, 10957, 58713, 321576, 1792133, 10131027, 57949430, 334970205, 1953890318, 11489753730, 68054102361, 405715557048
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.