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A187308 Half the number of (n+2) X (n+2) binary arrays with each 3 X 3 subblock having sum 3, 4, 5 or 6. 0
210, 18792, 5422402, 5243407780, 16720419105846, 176072290483114471, 6123962812371625570408 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A187317.

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

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

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

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

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

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

CROSSREFS

Sequence in context: A035840 A140904 A092711 * A229754 A089514 A289328

Adjacent sequences:  A187305 A187306 A187307 * A187309 A187310 A187311

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 08 2011

STATUS

approved

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Last modified August 15 20:49 EDT 2018. Contains 313779 sequences. (Running on oeis4.)