Number of nX3 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, and upper left element zero.
A230991
Number of nX3 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, and upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =14a(3) =182a(4) =2364a(5) =36020a(6) =513774a(7) =7466956a(8) =108082822a(9) =1565657608a(10) =22676496408a(11) =328443902490
External references
- oeis: A230991