Number of nonisomorphic graded posets with 0 and 1 and non-uniform Hasse graph of rank n, with exactly 2 elements of each rank level between 0 and 1.

A208736

Number of nonisomorphic graded posets with 0 and 1 and non-uniform Hasse graph of rank n, with exactly 2 elements of each rank level between 0 and 1.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =5a(5) =22a(6) =91a(7) =361a(8) =1392a(9) =5265a(10) =19653a(11) =72694a(12) =267179a(13) =977593a(14) =3565600a(15) =12975457a(16) =47142021a(17) =171075606a(18) =620303547a(19) =2247803785a(20) =8141857808a(21) =29481675889a(22) =106728951109a(23) =386314552438

External references