Coefficients of x in the reduction of the polynomial p(n,x)=(1/2)((x+2)^n+(x-2)^n) by x^2->x+1.

A192354

Coefficients of x in the reduction of the polynomial p(n,x)=(1/2)((x+2)^n+(x-2)^n) by x^2->x+1.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =14a(4) =27a(5) =165a(6) =428a(7) =2001a(8) =6069a(9) =25042a(10) =82555a(11) =319793a(12) =1101816a(13) =4131009a(14) =14567657a(15) =53697270a(16) =191684283a(17) =700312381a(18) =2515972324a(19) =9149426897a(20) =32981059485a(21) =119645675898a(22) =432046756571

External references