664112

Appears in sequences

• Number of defective 4-colorings of an n X 4 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..3 order.at n=14A229574
• Sum of lcm(gcd(i,j), gcd(k,l)) for i,j,k,l in range [1..n].at n=19A260842