64448228

Appears in sequences

• Number of distinct solutions of sum{i=1..9}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 2..n-2.at n=10A180821
• Number of distinct solutions of sum{i=1..9}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.at n=10A180832
• a(n) = (10 / ((3*n+1)*(3*n+2))) * binomial(4*n, n).at n=11A197271