Number of n X 3 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero.
A231280
Number of n X 3 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =8a(3) =66a(4) =400a(5) =2722a(6) =17688a(7) =117026a(8) =768800a(9) =5064642a(10) =33328168a(11) =219411586a(12) =1444225200a(13) =9506897762a(14) =62579419448a(15) =411934939746
External references
- oeis: A231280