Dirichlet convolution of Fibonacci numbers with 3^(n-1).

Terms

a(0) =1a(1) =4a(2) =11a(3) =33a(4) =86a(5) =266a(6) =742a(7) =2244a(8) =6613a(9) =19834a(10) =59138a(11) =177639a(12) =531674a(13) =1595468a(14) =4783786a(15) =14352225a(16) =43048318a(17) =129149968a(18) =387424670a(19) =1162288458a(20) =3486796922a(21) =10460430230a(22) =31381088266a(23) =94143408282a(24) =282429611911a(25) =847289262976