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

Terms

a(0) =0a(1) =1a(2) =0a(3) =3a(4) =2a(5) =10a(6) =16a(7) =43a(8) =92a(9) =213a(10) =486a(11) =1100a(12) =2522a(13) =5719a(14) =13068a(15) =29721a(16) =67772a(17) =154334a(18) =351670a(19) =801137a(20) =1825184a(21) =4158219a(22) =9473244a(23) =21582392a(24) =49169220a(25) =112018989a(26) =255203904a(27) =581412535a(28) =1324587918a(29) =3017709810