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

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =7a(5) =12a(6) =47a(7) =107a(8) =337a(9) =868a(10) =2520a(11) =6808a(12) =19192a(13) =52756a(14) =147185a(15) =407069a(16) =1131599a(17) =3136292a(18) =8707655a(19) =24151335a(20) =67025633a(21) =185946904a(22) =515971328a(23) =1431563056a(24) =3972149312a(25) =11021051864a(26) =30579529249a(27) =84846231017a(28) =235416993159a(29) =653192251196