T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.

A230899

T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =0a(6) =0a(7) =2a(8) =2a(9) =0a(10) =0a(11) =10a(12) =14a(13) =10a(14) =0a(15) =0a(16) =22a(17) =34a(18) =34a(19) =22a(20) =0a(21) =0a(22) =70a(23) =198a(24) =388a(25) =198a(26) =70a(27) =0a(28) =0a(29) =186

External references