Number of nonisomorphic graded posets with 0 and non-uniform Hasse graph of rank n, with exactly 2 elements of each rank level above 0.

A206948

Number of nonisomorphic graded posets with 0 and non-uniform Hasse graph of rank n, with exactly 2 elements of each rank level above 0.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =2a(4) =19a(5) =131a(6) =791a(7) =4446a(8) =23913a(9) =124892a(10) =638878a(11) =3218559a(12) =16027375a(13) =79093773a(14) =387540260a(15) =1887974063a(16) =9154751912a(17) =44221373872a(18) =212931964415

External references