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

A318850

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

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =18a(7) =43a(8) =102a(9) =250a(10) =623a(11) =1579a(12) =4042a(13) =10473a(14) =27356a(15) =72049a(16) =190991a(17) =509384a(18) =1365586a(19) =3678369a(20) =9949452a(21) =27014550a(22) =73600711a(23) =201153143a(24) =551329088a(25) =1515078957a(26) =4173575232a(27) =11522620375a(28) =31878127954a(29) =88362886345

External references