Number of n X 2 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.
A230920
Number of n X 2 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) =12a(2) =54a(3) =432a(4) =3108a(5) =22428a(6) =162504a(7) =1175592a(8) =8507376a(9) =61562808a(10) =445491480a(11) =3223753560a(12) =23328341064a(13) =168813022728
External references
- oeis: A230920