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 upper left element zero.
A230520
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 upper left element zero.
Terms
- a(0) =0a(1) =12a(2) =78a(3) =576a(4) =4374a(5) =32832a(6) =246726a(7) =1854576a(8) =13938966a(9) =104766048a(10) =787429350a(11) =5918371920a(12) =44482884534a(13) =334336382784
External references
- oeis: A230520