7012350

Appears in sequences

• Number of distinct solutions of sum{i=1..4}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 2..n-2.at n=24A180816
• a(n) = (n-2)*(n-3)*2^(n-2)+2^n-2.at n=16A217528