A235018 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 3, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

88, 1200, 14800, 170568, 1830768, 18670696, 180093160, 1680608680, 14967698864

Offset

1,1

Links

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

Example

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

Crossrefs

Diagonal of A235026.

Sequence in context: A228744 A249294 A239274 * A228810 A245954 A248047

Adjacent sequences: A235015 A235016 A235017 * A235019 A235020 A235021

Keyword

nonn

Author

R. H. Hardin, Jan 02 2014

Status

approved