3221225468domain: NAppears in sequencesBinomial transform of [1, 1, 5, 1, 5, 1, 5, ...].at n=30A131128Number of twiddle factors in the first stage of a Pease Radix 4 Fast Fourier Transform.at n=14A181358Expansion of x*(1 - x + 4*x^2) / ((1 - x)*(1 - 2*x)).at n=31A296954