T(n,k)=Number of nXk 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
A230926
T(n,k)=Number of nXk 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =12a(5) =0a(6) =0a(7) =54a(8) =54a(9) =0a(10) =0a(11) =432a(12) =408a(13) =432a(14) =0a(15) =0a(16) =3108a(17) =8748a(18) =8748a(19) =3108a(20) =0a(21) =0a(22) =22428a(23) =154632a(24) =559872a(25) =154632a(26) =22428a(27) =0a(28) =0a(29) =162504
External references
- oeis: A230926