187003944842domain: NAppears in sequencesNumber of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 2..n-2.at n=18A180820Number of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.at n=18A180831