173040domain: NAppears in sequencesa(n) = 256*n^2 - 16.at n=25A158562Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y>=2z.at n=31A212505E.g.f. satisfies A(x) = 1/(1 - x*A(x))^(x^2*A(x)^2).at n=8A371147