A234907 Number of (n+1) X (3+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

10344, 88092, 734168, 7067096, 66054728, 672221348, 6570232248, 68704964500, 683985508256, 7259539837372, 72890905317224, 781381537355308, 7883670351975704, 85183372948948496, 862313819512774208

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Column 3 of A234911.

Sequence in context: A097695 A031803 A396216 * A180460 A035912 A226599

Adjacent sequences: A234904 A234905 A234906 * A234908 A234909 A234910

Keyword

nonn

Author

R. H. Hardin, Jan 01 2014

Status

approved