905973760domain: NAppears in sequencesExpansion of x*(1-x)^2/( (1-2*x^2)*(1-2*x)^2).at n=26A178945a(n) = ((2^n*n + i*(1 - i)^n - i*(1 + i)^n))/4, where i is the imaginary unit.at n=27A323225