A234983 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 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

90, 1490, 34608, 1525462, 128653892, 24740904388, 10857686727324, 11461385380110162

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Diagonal of A234991.

Sequence in context: A133350 A279438 A250869 * A166817 A166799 A001561

Adjacent sequences: A234980 A234981 A234982 * A234984 A234985 A234986

Keyword

nonn

Author

R. H. Hardin, Jan 02 2014

Status

approved