T(n,k)=Number of nXk 0..3 arrays with exactly floor(nXk/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

A222747

T(n,k)=Number of nXk 0..3 arrays with exactly floor(nXk/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =6a(5) =0a(6) =6a(7) =32a(8) =20a(9) =0a(10) =20a(11) =657a(12) =2438a(13) =685a(14) =0a(15) =20a(16) =7546a(17) =126947a(18) =125094a(19) =5370a(20) =0a(21) =70a(22) =124363a(23) =6363724a(24) =27397461a(25) =6821264a(26) =123410a(27) =0a(28) =685a(29) =1710608

External references