Number of binary relations R on {1,2,...,n} such that the transitive closure of R is the trivial relation.

A186081

Number of binary relations R on {1,2,...,n} such that the transitive closure of R is the trivial relation.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =144a(4) =25696a(5) =18082560a(6) =47025585664

External references