1731840

Appears in sequences

• Half the number of 3 X n binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.at n=8A069429
• Half the number of n X 9 binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.at n=1A069447
• Number of (n+1) X (1+1) 0..2 arrays with every 2 X 2 subblock summing to a nonzero multiple of 2.at n=7A251203
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock summing to a nonzero multiple of 2.at n=28A251210
• Triangular array read by rows: T(n,0) = 2^n, T(n,k) = Sum_{i=n-k..n, j=0..i-n+k, i<>n or j<>k} T(i,j) for k > 0.at n=54A337129