54067

Appears in sequences

• Number of n X 4 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors not equal to itself.at n=17A265988
• a(n) = 4*p(n-1)*p(n+1) - p(n)^2, where p(k) = k-th prime.at n=31A327447
• a(n) = Sum_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|)/8.at n=40A331773
• a(n) = 2*a(n-1) + 2*a(n-2) + 2*a(n-3) - a(n-4) with a(0)=0, a(1)=1, a(2)=4, a(3)=11.at n=11A387018