A234482 Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).

62, 926, 13260, 183422, 2455350, 31925284, 404043442, 4993740182, 60359720132

Offset

1,1

Links

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

Example

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

Crossrefs

Diagonal of A234490.

Sequence in context: A196413 A131473 A138408 * A157499 A249235 A250564

Adjacent sequences: A234479 A234480 A234481 * A234483 A234484 A234485

Keyword

nonn

Author

R. H. Hardin, Dec 26 2013

Status

approved