a(n) = n*Fibonacci(n) - Sum_{i=0..n-1} Fibonacci(i).

Terms

a(0) =0a(1) =1a(2) =1a(3) =4a(4) =8a(5) =18a(6) =36a(7) =71a(8) =135a(9) =252a(10) =462a(11) =836a(12) =1496a(13) =2653a(14) =4669a(15) =8164a(16) =14196a(17) =24566a(18) =42332a(19) =72675a(20) =124355a(21) =212156a(22) =360986a(23) =612744a(24) =1037808a(25) =1754233a(26) =2959801a(27) =4985476a(28) =8384480a(29) =14080602