503616domain: NAppears in sequencesCoefficient of q^2 in nu(n), where nu(0)=1, nu(1)=b and, for n>=2, nu(n)=b*nu(n-1)+lambda*(1+q+q^2+...+q^(n-2))*nu(n-2) with (b,lambda)=(2,2).at n=12A074359Number of n X n arrays of squares of integers summing to 14.at n=2A159392