Convolution of natural numbers >= 2 and Fibonacci numbers.

Terms

a(0) =2a(1) =5a(2) =11a(3) =21a(4) =38a(5) =66a(6) =112a(7) =187a(8) =309a(9) =507a(10) =828a(11) =1348a(12) =2190a(13) =3553a(14) =5759a(15) =9329a(16) =15106a(17) =24454a(18) =39580a(19) =64055a(20) =103657a(21) =167735a(22) =271416a(23) =439176a(24) =710618a(25) =1149821a(26) =1860467a(27) =3010317a(28) =4870814a(29) =7881162