Number of bicolored acyclic graphs on n unlabeled nodes.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =65a(7) =134a(8) =280a(9) =598a(10) =1300a(11) =2884a(12) =6516a(13) =15008a(14) =35147a(15) =83680a(16) =202139a(17) =494982a(18) =1226753a(19) =3074146a(20) =7779561a(21) =19863702a(22) =51125018a(23) =132541616a(24) =345867101a(25) =907922596a(26) =2396276355a(27) =6355845398a(28) =16934718359a(29) =45309972502