Number of symmetric racks of order n, up to isomorphism.

A386231

Number of symmetric racks of order n, up to isomorphism.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =9a(4) =42a(5) =154a(6) =1064a(7) =6678a(8) =73780

External references