A234168 Number of (n+1) X (7+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).

4299592, 57811490, 751361300, 10438586426, 142146253428, 2098023535022, 30141337964332, 482175603720094, 7367000748255208

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Column 7 of A234169.

Sequence in context: A232351 A210308 A205271 * A015349 A210403 A263155

Adjacent sequences: A234165 A234166 A234167 * A234169 A234170 A234171

Keyword

nonn

Author

R. H. Hardin, Dec 20 2013

Status

approved