Number of nonisomorphic and nonantiisomorphic reflexive transitive and cotransitive (complement is transitive) relations.

A030270

Number of nonisomorphic and nonantiisomorphic reflexive transitive and cotransitive (complement is transitive) relations.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =5a(4) =12a(5) =24a(6) =58a(7) =128a(8) =309a(9) =717a(10) =1731a(11) =4109a(12) =9920a(13) =23780a(14) =57410a(15) =138192a(16) =333625a(17) =804457a(18) =1942131a(19) =4686341a(20) =11313828a(21) =27308256a(22) =65927962a(23) =159150320a(24) =384222861a(25) =927562581a(26) =2239334163a(27) =5406150125a(28) =13051600952a(29) =31509157004

External references