A234219 Number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant-stress 1 X 1 tilings).

104, 1560, 17448, 167688, 1379816, 11145960, 83324136, 639913896, 4699132904

Offset

1,1

Links

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

Example

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

Crossrefs

Diagonal of A234227.

Sequence in context: A132434 A187589 A200196 * A223420 A250325 A244946

Adjacent sequences: A234216 A234217 A234218 * A234220 A234221 A234222

Keyword

nonn

Author

R. H. Hardin, Dec 21 2013

Status

approved