a(n) = Sum_{j=0..n} j*Fibonacci(j).

Terms

a(0) =0a(1) =1a(2) =3a(3) =9a(4) =21a(5) =46a(6) =94a(7) =185a(8) =353a(9) =659a(10) =1209a(11) =2188a(12) =3916a(13) =6945a(14) =12223a(15) =21373a(16) =37165a(17) =64314a(18) =110826a(19) =190265a(20) =325565a(21) =555431a(22) =945073a(23) =1604184a(24) =2717016a(25) =4592641a(26) =7748859a(27) =13052145a(28) =21950853a(29) =36863494