Coefficient of x in the reduction of the n-th Fibonacci polynomial by x^3->x^2+1.

Terms

a(0) =0a(1) =1a(2) =0a(3) =2a(4) =1a(5) =4a(6) =6a(7) =12a(8) =25a(9) =46a(10) =96a(11) =183a(12) =368a(13) =720a(14) =1424a(15) =2809a(16) =5536a(17) =10930a(18) =21545a(19) =42516a(20) =83846a(21) =165404a(22) =326257a(23) =643550a(24) =1269440a(25) =2503983a(26) =4939232a(27) =9742752a(28) =19217952a(29) =37908017