59456

Appears in sequences

• Total number of line segments between points visible to each other in a square n X n lattice.at n=20A141255
• a(n) = Sum_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|)/8.at n=41A331773
• a(n) = Sum_{k=1..n-1} sigma(k) * sigma_2(n-k).at n=24A374974