300828domain: NAppears in sequencesNumber of nonnegative solutions of x1^2 + x2^2 + ... + x12^2 = n.at n=26A045853Row sums of A281348.at n=10A281347G.f. A(x) satisfies: A(x) = A(x^2) / (1 - 2*x).at n=17A309728