Number of irredundant sets in the complete tripartite graph K_{n,n,n}.

Terms

a(0) =4a(1) =22a(2) =49a(3) =94a(4) =169a(5) =298a(6) =529a(7) =958a(8) =1777a(9) =3370a(10) =6505a(11) =12718a(12) =25081a(13) =49738a(14) =98977a(15) =197374a(16) =394081a(17) =787402a(18) =1573945a(19) =3146926a(20) =6292777a(21) =12584362a(22) =25167409a(23) =50333374a(24) =100665169a(25) =201328618a(26) =402655369a(27) =805308718a(28) =1610615257a(29) =3221228170