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

A318852

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

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =20a(7) =47a(8) =113a(9) =281a(10) =706a(11) =1807a(12) =4671a(13) =12223a(14) =32245a(15) =85777a(16) =229670a(17) =618732a(18) =1675523a(19) =4559000a(20) =12456756a(21) =34166545a(22) =94034740a(23) =259621512a(24) =718846854a(25) =1995610386a(26) =5553500697a(27) =15489256677a(28) =43290763753a(29) =121226491459

External references