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

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =6a(5) =10a(6) =34a(7) =74a(8) =206a(9) =499a(10) =1301a(11) =3264a(12) =8348a(13) =21152a(14) =53828a(15) =136720a(16) =347533a(17) =883157a(18) =2244462a(19) =5704094a(20) =14496130a(21) =36840606a(22) =93625542a(23) =237939591a(24) =604694601a(25) =1536764208a(26) =3905506648a(27) =9925401280a(28) =25224262440a(29) =64104575344