11184809domain: NAppears in sequencesa(n) = (8*2^n-5*(-1)^n)/3.at n=22A083582a(n) = (8*4^n - 5)/3.at n=11A083584Expansion of x*(1+2*x)/((1+x)*(1-x)*(1-2*x)).at n=23A084639Expansion of (1-x+2*x^2)/((1-x)*(1-x-2*x^2)).at n=23A097074First differences of A130624.at n=23A130625