Number of isomorphism classes of associative non-commutative closed binary operations on a set of order n, listed by class size.

A079200

Number of isomorphism classes of associative non-commutative closed binary operations on a set of order n, listed by class size.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =0a(4) =2a(5) =0a(6) =4a(7) =6a(8) =2a(9) =0a(10) =0a(11) =4a(12) =5a(13) =0a(14) =46a(15) =73a(16) =2a(17) =0a(18) =0a(19) =0a(20) =4a(21) =0a(22) =0a(23) =8a(24) =0a(25) =2a(26) =36a(27) =0a(28) =43a(29) =2

External references