Number of interval posets of permutations of size n, considered up to isomorphism.

A373455

Number of interval posets of permutations of size n, considered up to isomorphism.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =15a(5) =43a(6) =124a(7) =379a(8) =1172a(9) =3730a(10) =12023a(11) =39388a(12) =130377a(13) =436066a(14) =1470271a(15) =4994083a(16) =17069343a(17) =58669677a(18) =202648664a(19) =703064353a(20) =2448871526a(21) =8560428736a(22) =30021944259a(23) =105602286616a(24) =372469127865

External references