A234726 Number of (n+1) X (6+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant-stress 1 X 1 tilings).

339328, 692512, 1349336, 3403528, 8002936, 23137720, 62379416, 197412088, 587074168, 1982807032, 6335722136, 22491544888, 75906457336, 280381206520, 988119053336, 3770353824568, 13765440733048, 53960918334712

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Column 6 of A234728.

Sequence in context: A185475 A224632 A350186 * A132660 A236609 A103808

Adjacent sequences: A234723 A234724 A234725 * A234727 A234728 A234729

Keyword

nonn

Author

R. H. Hardin, Dec 30 2013

Status

approved