Number of 2 X n 0..3 arrays x(i,j) with each element horizontally, diagonally 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.
A231081
Number of 2 X n 0..3 arrays x(i,j) with each element horizontally, diagonally 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) =40a(4) =356a(5) =1840a(6) =10128a(7) =60808a(8) =337016a(9) =1932520a(10) =11047240a(11) =62712776a(12) =358084712a(13) =2039935624a(14) =11622103656a(15) =66251217992a(16) =377502949416
External references
- oeis: A231081