Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 2.

A244456

Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 2.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =2a(4) =4a(5) =7a(6) =15a(7) =28a(8) =56a(9) =110a(10) =220a(11) =436a(12) =878a(13) =1762a(14) =3560a(15) =7205a(16) =14650a(17) =29838a(18) =60991a(19) =124938a(20) =256628a(21) =528238a(22) =1089834a(23) =2252860a(24) =4666304a(25) =9682422a(26) =20125777a(27) =41900433a(28) =87369029a(29) =182441944

External references