A235257 Number of (n+1) X (7+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).

600928, 1330480, 2873128, 7200188, 17480904, 47995084, 126993640, 373324260, 1053946488, 3264942732, 9696780840, 31291585876

Offset

1,1

Comments

Column 7 of A235258.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A106780 A304000 A206412 * A185928 A270262 A238310

Adjacent sequences: A235254 A235255 A235256 * A235258 A235259 A235260

Keyword

nonn

Author

R. H. Hardin, Jan 05 2014

Status

approved