login
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
OFFSET
1,1
COMMENTS
Diagonal of A187317.
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 08 2011
STATUS
approved