Number of elements in the semigroup of type K_n.

A125625

Number of elements in the semigroup of type K_n.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =18a(4) =115a(5) =1710a(6) =83973a(7) =22263378a(8) =64146328635

External references