T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal.

A237211

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal.

Terms

    a(0) =256a(1) =1160a(2) =1160a(3) =5130a(4) =8396a(5) =5130a(6) =24478a(7) =59386a(8) =59386a(9) =24478a(10) =117800a(11) =472096a(12) =655186a(13) =472096a(14) =117800a(15) =581660a(16) =3795060a(17) =8448682a(18) =8448682a(19) =3795060a(20) =581660a(21) =2899672a(22) =31758656a(23) =107553623a(24) =185371924a(25) =107553623a(26) =31758656a(27) =2899672

External references