74452domain: NAppears in sequencesa(n) = [x^(n^2)] (theta_3(x) - 1)^n/(2^n*(1 - x)), where theta_3() is the Jacobi theta function.at n=8A302995Number of positive solutions to (x_1)^2 + (x_2)^2 + ... + (x_8)^2 <= n^2.at n=5A341427