Wiener indices of Fibonacci trees of order k.

Terms

a(0) =1a(1) =4a(2) =18a(3) =62a(4) =210a(5) =666a(6) =2063a(7) =6226a(8) =18484a(9) =54100a(10) =156620a(11) =449268a(12) =1278981a(13) =3617544a(14) =10175590a(15) =28485218a(16) =79406350a(17) =220536910a(18) =610487875a(19) =1684974790a(20) =4638298536a(21) =12737460744a(22) =34902844728a(23) =95449821672a(24) =260554112425a(25) =710056257196