T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally 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.
A230831
T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally 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) =6a(12) =8a(13) =6a(14) =0a(15) =0a(16) =16a(17) =10a(18) =10a(19) =16a(20) =0a(21) =0a(22) =44a(23) =38a(24) =62a(25) =38a(26) =44a(27) =0a(28) =0a(29) =124
External references
- oeis: A230831