T(n,k)=Number of nXk 0..6 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

A203389

T(n,k)=Number of nXk 0..6 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =7a(5) =1a(6) =1a(7) =49a(8) =49a(9) =1a(10) =1a(11) =252a(12) =2422a(13) =252a(14) =1a(15) =1a(16) =1519a(17) =65653a(18) =65653a(19) =1519a(20) =1a(21) =1a(22) =11585a(23) =1644254a(24) =7951793a(25) =1644254a(26) =11585a(27) =1a(28) =1a(29) =86156

External references