A235311 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 7 (constant-stress 1 X 1 tilings).

112, 1120, 5968, 40144, 184144, 1062832, 4632208, 24862768, 106979152, 553292080, 2391038608

Offset

1,1

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Diagonal of A235319.

Sequence in context: A206311 A343372 A330418 * A008430 A249004 A249469

Adjacent sequences: A235308 A235309 A235310 * A235312 A235313 A235314

Keyword

nonn

Author

R. H. Hardin, Jan 05 2014

Status

approved