a(n) = Sum_{k=0..n} k*Fibonacci(2*k).

Terms

a(0) =0a(1) =1a(2) =7a(3) =31a(4) =115a(5) =390a(6) =1254a(7) =3893a(8) =11789a(9) =35045a(10) =102695a(11) =297516a(12) =853932a(13) =2432041a(14) =6881395a(15) =19361995a(16) =54214939a(17) =151164018a(18) =419910354a(19) =1162585565a(20) =3209268665a(21) =8835468881a(22) =24266461007a(23) =66501634776a(24) =181882282200a(25) =496539007825