A235178 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 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

72, 560, 3240, 19584, 99096, 540368, 2598040, 13521264, 64019304, 326134032, 1542290552, 7781321872

Offset

1,1

Links

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

Example

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

Crossrefs

Diagonal of A235186.

Sequence in context: A156632 A353218 A204484 * A085718 A205329 A077120

Adjacent sequences: A235175 A235176 A235177 * A235179 A235180 A235181

Keyword

nonn

Author

R. H. Hardin, Jan 04 2014

Status

approved