Coefficient of x^2 in the reduction by (x^3 -> x + 1) of the polynomial F(n+1)*x^n, where F(n)=A000045 (Fibonacci sequence).

A192913

Coefficient of x^2 in the reduction by (x^3 -> x + 1) of the polynomial F(n+1)*x^n, where F(n)=A000045 (Fibonacci sequence).

Terms

    a(0) =0a(1) =0a(2) =2a(3) =3a(4) =10a(5) =32a(6) =91a(7) =273a(8) =816a(9) =2420a(10) =7209a(11) =21456a(12) =63842a(13) =190008a(14) =565470a(15) =1682835a(16) =5008192a(17) =14904512a(18) =44356229a(19) =132005445a(20) =392851940a(21) =1169138532a(22) =3479389655a(23) =10354762656a(24) =30816068600a(25) =91709498068a(26) =272930078466a(27) =812247687927

External references