Number of nX4 0..3 arrays x(i,j) with each element horizontally or vertically 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, no adjacent elements equal, and upper left element zero.
A230895
Number of nX4 0..3 arrays x(i,j) with each element horizontally or vertically 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, no adjacent elements equal, and upper left element zero.
Terms
- a(0) =0a(1) =10a(2) =34a(3) =388a(4) =2722a(5) =23884a(6) =190364a(7) =1588552a(8) =13012554a(9) =107455420a(10) =884594172a(11) =7291800446a(12) =60076189804a(13) =495070806968
External references
- oeis: A230895