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

A237158

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

Terms

    a(0) =256a(1) =1868a(2) =1868a(3) =14096a(4) =37652a(5) =14096a(6) =111900a(7) =762508a(8) =762508a(9) =111900a(10) =912848a(11) =16547988a(12) =39065788a(13) =16547988a(14) =912848a(15) =7609244a(16) =367558796a(17) =2178706440a(18) =2178706440a(19) =367558796a(20) =7609244a(21) =64386416a(22) =8327731884a(23) =122764464080

External references