Number of rooted trees with n nodes such that no more than four isomorphic subtrees extend from the same node.

A318851

Number of rooted trees with n nodes such that no more than four isomorphic subtrees extend from the same node.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =19a(7) =46a(8) =110a(9) =273a(10) =684a(11) =1746a(12) =4503a(13) =11758a(14) =30943a(15) =82118a(16) =219341a(17) =589485a(18) =1592447a(19) =4322433a(20) =11781565a(21) =32235688a(22) =88503331a(23) =243750729a(24) =673246211a(25) =1864422803a(26) =5175655984a(27) =14399854855a(28) =40146793094a(29) =112145140408

External references