Number of nonisomorphic graded posets with 0 and non-uniform Hasse graph of rank n, with no 3-element antichain.
A206950
Number of nonisomorphic graded posets with 0 and non-uniform Hasse graph of rank n, with no 3-element antichain.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =3a(4) =33a(5) =259a(6) =1762a(7) =11093a(8) =66592a(9) =387264a(10) =2202053a(11) =12314587a(12) =67995221a(13) =371697914a(14) =2015659707a(15) =10859379024a(16) =58190011080a(17) =310409500291
External references
- oeis: A206950