A235231 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 6, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

120, 1288, 9656, 77368, 496520, 3512000, 21123784, 140450408, 822331208, 5291121256

Offset

1,1

Comments

Diagonal of A235239.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A371107 A371051 A259519 * A348216 A167549 A052776

Adjacent sequences: A235228 A235229 A235230 * A235232 A235233 A235234

Keyword

nonn

Author

R. H. Hardin, Jan 05 2014

Status

approved