156920

Appears in sequences

• Number of (n+1) X 2 binary arrays with every 2 X 2 subblock trace equal to some horizontal or vertical neighbor 2 X 2 subblock trace.at n=10A185742
• Number of -3..3 arrays x(0..n-1) of n elements with zero sum and no two neighbors equal.at n=7A199699
• T(n,k)=Number of -k..k arrays x(0..n-1) of n elements with zero sum and no two neighbors equal.at n=52A199704
• a(1)=1, a(n+1) = prime(a(n)+1) - a(n).at n=11A207573