T(n,k)=Number of nXk 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

A203346

T(n,k)=Number of nXk 0..4 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) =5a(5) =1a(6) =1a(7) =25a(8) =25a(9) =1a(10) =1a(11) =95a(12) =635a(13) =95a(14) =1a(15) =1a(16) =425a(17) =9555a(18) =9555a(19) =425a(20) =1a(21) =1a(22) =2329a(23) =142167a(24) =503409a(25) =142167a(26) =2329a(27) =1a(28) =1a(29) =12487

External references