10513816601domain: NAppears in sequencesExpansion of 1/(1 - 4*x + 5*x^2).at n=28A099456Column 0 of triangle A118435.at n=29A118436Values of y such that x^2 + y^2 = 5^n with x and y coprime and 0 < x < y.at n=28A230711