A235250 Number of (n+1) X (n+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 7, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

184, 2592, 24232, 247368, 1951752, 17318888, 126993640, 1048328248, 7433492968

Offset

1,1

Comments

Diagonal of A235258.

Links

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

Example

Some solutions for n=3:
  5 4 5 3    1 4 2 6    5 1 6 0    0 4 1 3    1 7 3 6
  0 6 0 5    4 0 5 2    1 4 2 3    4 1 5 0    3 2 5 1
  5 4 5 3    0 3 1 5    6 2 7 1    2 6 3 5    0 6 2 5
  0 6 0 5    4 0 5 2    4 7 5 6    5 2 6 1    3 2 5 1

Crossrefs

Sequence in context: A234146 A164997 A121733 * A221931 A223117 A221782

Adjacent sequences: A235247 A235248 A235249 * A235251 A235252 A235253

Keyword

nonn

Author

R. H. Hardin, Jan 05 2014

Status

approved