1648692

Appears in sequences

• a(n) = Sum_{k=0..2*n-2} T(n, k)*T(n, k+2), T given by A027960.at n=8A027986
• a(n) is the decimal value corresponding to the binary representation of the distribution of quadratic residues (value=1) and non-quadratic residues (value=0) mod n, where numbers are ordered left to right from 0 to n-1.at n=20A280109