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

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =6a(6) =14a(7) =26a(8) =52a(9) =103a(10) =201a(11) =400a(12) =784a(13) =1552a(14) =3056a(15) =6032a(16) =11897a(17) =23465a(18) =46292a(19) =91302a(20) =180110a(21) =355258a(22) =700772a(23) =1382287a(24) =2726609a(25) =5378336a(26) =10608928a(27) =20926496a(28) =41278176a(29) =81422624