Number of rooted trees with n nodes and a single labeled node; pointed rooted trees; vertebrates.

A000107

Number of rooted trees with n nodes and a single labeled node; pointed rooted trees; vertebrates.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =5a(4) =13a(5) =35a(6) =95a(7) =262a(8) =727a(9) =2033a(10) =5714a(11) =16136a(12) =45733a(13) =130046a(14) =370803a(15) =1059838a(16) =3035591a(17) =8710736a(18) =25036934a(19) =72069134a(20) =207727501a(21) =599461094a(22) =1731818878a(23) =5008149658a(24) =14496034714a(25) =41993925955a(26) =121747732406a(27) =353221737526

External references