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

A237677

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

Terms

    a(0) =256a(1) =1564a(2) =1564a(3) =9647a(4) =14244a(5) =9647a(6) =63000a(7) =132572a(8) =132572a(9) =63000a(10) =412120a(11) =1346420a(12) =1915153a(13) =1346420a(14) =412120a(15) =2668500a(16) =13569422a(17) =30618976a(18) =30618976a(19) =13569422a(20) =2668500a(21) =17280632a(22) =134401476a(23) =482106388a(24) =796647426a(25) =482106388a(26) =134401476

External references