A234815 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 (constant-stress 1 X 1 tilings).

168, 2220, 15224, 129384, 747192, 5441232, 29871848, 201644928, 1092396888, 7078853280

Offset

1,1

Links

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

Example

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

Crossrefs

Diagonal of A234823.

Sequence in context: A235926 A279725 A234730 * A232274 A110075 A360623

Adjacent sequences: A234812 A234813 A234814 * A234816 A234817 A234818

Keyword

nonn

Author

R. H. Hardin, Dec 31 2013

Status

approved