A235079 Number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

38, 198, 830, 3558, 13446, 53590, 196302, 763814, 2809478, 10902494, 40824462, 159294206, 608274054, 2390311294, 9275377822

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=5:
  0 2 0 2 1 3    1 4 2 3 1 4    3 1 4 1 3 0    1 4 1 3 1 3
  3 1 3 1 4 2    3 2 4 1 3 2    0 2 1 2 0 1    3 2 3 1 3 1
  0 2 0 2 1 3    1 4 2 3 1 4    3 1 4 1 3 0    1 4 1 3 1 3
  3 1 3 1 4 2    3 2 4 1 3 2    1 3 2 3 1 2    3 2 3 1 3 1
  1 3 1 3 2 4    1 4 2 3 1 4    3 1 4 1 3 0    0 3 0 2 0 2
  2 0 2 0 3 1    3 2 4 1 3 2    0 2 1 2 0 1    3 2 3 1 3 1

Crossrefs

Diagonal of A235087.

Sequence in context: A137022 A160064 A297541 * A005910 A281769 A191698

Adjacent sequences: A235076 A235077 A235078 * A235080 A235081 A235082

Keyword

nonn

Author

R. H. Hardin, Jan 03 2014

Status

approved