A030265 Number of nonisomorphic commutative groupoids with 1 idempotent and a nontrivial symmetry.
0, 0, 6, 214, 83925
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.