Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes such that the maximum of the node outdegrees equals four.

A292230

Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes such that the maximum of the node outdegrees equals four.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =22a(4) =72a(5) =230a(6) =751a(7) =2442a(8) =8006a(9) =26280a(10) =86604a(11) =285994a(12) =946866a(13) =3140812a(14) =10438300a(15) =34747649a(16) =115849084a(17) =386779317a(18) =1292998720a(19) =4327654320a(20) =14500841169a(21) =48639319376a(22) =163308287353a(23) =548820437392

External references