A235090 Number of (n+1) X (n+1) 0..5 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).

80, 656, 3832, 21264, 102336, 524728, 2420288, 12147808, 55604120, 276524288, 1267295968, 6262860184

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Diagonal of A235098.

Sequence in context: A342188 A255478 A204342 * A211693 A164753 A279745

Adjacent sequences: A235087 A235088 A235089 * A235091 A235092 A235093

Keyword

nonn

Author

R. H. Hardin, Jan 03 2014

Status

approved