163480

Appears in sequences

• Number of distinct solutions of sum{i=1..9}(x(2i-1)*x(2i)) = 0 (mod n), with x() in 0..n-1.at n=4A180801
• a(n) = 4^n * [x^n] 1/sqrt(1-x) * Product_{k>=1} (1 + x^k).at n=7A325950