Number of n-node rooted identity trees with thinning limbs and root outdegree (branching factor) 6.

Terms

a(0) =2a(1) =6a(2) =23a(3) =60a(4) =162a(5) =397a(6) =960a(7) =2223a(8) =5085a(9) =11355a(10) =25088a(11) =54654a(12) =118051a(13) =252601a(14) =536973a(15) =1133925a(16) =2382281a(17) =4980512a(18) =10370545a(19) =21512821a(20) =44483291a(21) =91708748a(22) =188580249a(23) =386854596a(24) =791909788a(25) =1617922147a(26) =3299701619a(27) =6718766927a(28) =13660421145a(29) =27736326713