A234893 Number of (n+1) X (3+1) 0..6 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).

3456, 20404, 113288, 743436, 4634504, 32110856, 208211944, 1482491852, 9763925800, 70741188392, 469704123072, 3449044260864, 23022329803976, 170950844777056, 1145540286614792, 8587053971274908, 57714312161683112

Offset

1,1

Links

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

Example

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

Crossrefs

Column 3 of A234898.

Sequence in context: A340437 A278270 A179705 * A251485 A082242 A321866

Adjacent sequences: A234890 A234891 A234892 * A234894 A234895 A234896

Keyword

nonn

Author

R. H. Hardin, Jan 01 2014

Status

approved