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

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =7a(6) =12a(7) =41a(8) =86a(9) =247a(10) =585a(11) =1548a(12) =3849a(13) =9896a(14) =25001a(15) =63724a(16) =161721a(17) =411257a(18) =1044878a(19) =2655719a(20) =6748972a(21) =17151849a(22) =43589578a(23) =110777391a(24) =281529169a(25) =715471992a(26) =1818293377a(27) =4620978640a(28) =11743694657a(29) =29845241080