Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 1.

A244455

Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 1.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =7a(4) =17a(5) =42a(6) =105a(7) =267a(8) =684a(9) =1775a(10) =4639a(11) =12238a(12) =32491a(13) =86859a(14) =233496a(15) =631082a(16) =1713613a(17) =4673455a(18) =12795426a(19) =35159212a(20) =96927479a(21) =268021520a(22) =743188706a(23) =2066071045a(24) =5757360011a(25) =16079027344a(26) =44997313684a(27) =126166307275a(28) =354384737204a(29) =997083779801

External references