Number of nonisomorphic graded posets with 0 of rank n with no 3-element antichain.
A206901
Number of nonisomorphic graded posets with 0 of rank n with no 3-element antichain.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =39a(4) =199a(5) =1027a(6) =5316a(7) =27539a(8) =142694a(9) =739416a(10) =3831589a(11) =19855045a(12) =102887673a(13) =533158028a(14) =2762794601a(15) =14316644946a(16) =74188042696a(17) =384438233215
External references
- oeis: A206901