77456

Appears in sequences

• G.f.: -x*(1-2*x+2*x^2)/(2*x^3-4*x^2+4*x-1).at n=12A078484
• Number of (w,x,y,z) with all terms in {1,...,n} and w^2>=x^2+y^2+z^2.at n=28A212095