A235099 Number of (n+1) X (n+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

154, 2498, 30312, 304746, 2613410, 20552136, 147069470, 1019570090, 6616067648

Offset

1,1

Links

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

Example

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

Crossrefs

Diagonal of A235107.

Sequence in context: A160840 A160841 A160853 * A332421 A227977 A282557

Adjacent sequences: A235096 A235097 A235098 * A235100 A235101 A235102

Keyword

nonn

Author

R. H. Hardin, Jan 03 2014

Status

approved