Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [2].

A220826

Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [2].

Terms

    a(0) =2a(1) =3a(2) =4a(3) =6a(4) =12a(5) =31a(6) =78a(7) =234a(8) =722a(9) =2376a(10) =8046a(11) =28263a(12) =101226a(13) =370389a(14) =1375728a(15) =5182107a(16) =19743204a(17) =75994993a(18) =295110996a(19) =1155128397a(20) =4553360558a(21) =18063221619a(22) =72069527418a(23) =289053637621

External references