A234325 Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1 (constant-stress 1 X 1 tilings).

80, 3296, 287888, 53812604, 21167182224, 17748461638244, 31177141022942176, 116792004877640829552

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Diagonal of A234333.

Sequence in context: A035735 A035805 A017743 * A196280 A286789 A264372

Adjacent sequences: A234322 A234323 A234324 * A234326 A234327 A234328

Keyword

nonn

Author

R. H. Hardin, Dec 23 2013

Status

approved