Number of nonisomorphic graded posets with 0 and uniform Hasse diagram of rank n with no 3-element antichain.

A206902

Number of nonisomorphic graded posets with 0 and uniform Hasse diagram of rank n with no 3-element antichain.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =36a(4) =166a(5) =768a(6) =3554a(7) =16446a(8) =76102a(9) =352152a(10) =1629536a(11) =7540458a(12) =34892452a(13) =161460114a(14) =747134894a(15) =3457265922a(16) =15998031616a(17) =74028732924a(18) =342557973998

External references