Number of nX4 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, no adjacent elements equal, and upper left element zero.
A230906
Number of nX4 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, no adjacent elements equal, and upper left element zero.
Terms
- a(0) =0a(1) =26a(2) =152a(3) =802a(4) =4308a(5) =23614a(6) =130178a(7) =718750a(8) =3970738a(9) =21941252a(10) =121252356a(11) =670093980a(12) =3703301746a(13) =20466628218a(14) =113111135842a(15) =625122784014
External references
- oeis: A230906