A187960 Half the number of (n+2)X7 binary arrays with no 3X3 subblock having a sum equal to any horizontal or vertical neighbor 3X3 subblock sum.

240064, 2092928, 16890700, 124421880, 1218772461, 11568061339, 98476432408, 907622916436

Offset

1,1

Comments

Column 5 of A187964

Links

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

Example

Some solutions for 4X7 with a(1,1)=0
..0..0..1..1..1..1..1....0..0..0..1..0..0..0....0..0..1..0..1..1..0
..0..0..0..1..0..1..1....0..0..0..1..1..1..0....0..0..0..0..0..1..0
..0..0..0..1..0..1..0....0..0..0..1..0..1..1....0..0..0..1..1..1..0
..0..0..0..0..1..0..0....0..0..1..1..1..0..0....0..0..0..0..0..1..0

Crossrefs

Sequence in context: A234547 A234709 A015345 * A190388 A389730 A249194

Adjacent sequences: A187957 A187958 A187959 * A187961 A187962 A187963

Keyword

nonn

Author

R. H. Hardin, Mar 16 2011

Status

approved