A234730 Number of (n+1) X (n+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 8 (constant-stress 1 X 1 tilings).

168, 2184, 14760, 127032, 737160, 5395128, 29705640, 200901240, 1089859848, 7067621304

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4:
  4 5 0 5 2      3 2 3 2 7      4 6 4 6 2      1 4 1 5 1
  7 0 3 0 5      0 7 0 7 4      7 1 7 1 5      7 2 7 3 7
  5 6 1 6 3      3 2 3 2 7      3 5 3 5 1      3 6 3 7 3
  7 0 3 0 5      0 7 0 7 4      6 0 6 0 4      5 0 5 1 5
  5 6 1 6 3      3 2 3 2 7      5 7 5 7 3      0 3 0 4 0

Crossrefs

Diagonal of A234738.

Sequence in context: A235932 A235926 A279725 * A234815 A232274 A110075

Adjacent sequences: A234727 A234728 A234729 * A234731 A234732 A234733

Keyword

nonn

Author

R. H. Hardin, Dec 30 2013

Status

approved