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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 0
240064, 2092928, 16890700, 124421880, 1218772461, 11568061339, 98476432408, 907622916436 (list; graph; refs; listen; history; text; internal format)
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 A249194 A281887

Adjacent sequences: A187957 A187958 A187959 * A187961 A187962 A187963

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2011

STATUS

approved

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)