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A187955 Half the number of (n+2)X(n+2) binary arrays with no 3X3 subblock having a sum equal to any horizontal or vertical neighbor 3X3 subblock sum 0
256, 8768, 359488, 15189800, 1218772461 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A187964

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for 4X4 with a(1,1)=0

..0..1..1..1....0..0..1..1....0..0..0..1....0..0..0..1....0..0..0..0

..0..1..0..1....1..1..1..1....0..1..1..1....1..1..0..1....1..1..1..0

..1..0..1..1....0..0..0..0....0..1..1..1....0..1..0..1....0..1..1..0

..0..0..1..0....1..1..0..0....1..1..1..0....0..1..0..1....0..1..0..0

CROSSREFS

Sequence in context: A206129 A236214 A232959 * A253135 A128991 A230973

Adjacent sequences: A187952 A187953 A187954 * A187956 A187957 A187958

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2011

STATUS

approved

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Last modified December 8 12:03 EST 2022. Contains 358693 sequences. (Running on oeis4.)