T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.

A237921

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.

Terms

    a(0) =256a(1) =1584a(2) =1584a(3) =9892a(4) =14564a(5) =9892a(6) =63476a(7) =133528a(8) =133528a(9) =63476a(10) =406468a(11) =1282504a(12) =1907520a(13) =1282504a(14) =406468a(15) =2591160a(16) =12149024a(17) =27873820a(18) =27873820a(19) =12149024a(20) =2591160a(21) =16574240a(22) =115206520a(23) =405401852a(24) =636891488a(25) =405401852a(26) =115206520

External references