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A183313
Number of n X n binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it
1
2, 6, 43, 480, 11385, 455509, 35629548, 4963103592, 1301324910599, 621440459491278, 550719742223029437, 895987628972185952650, 2692063790042095644897446, 14888067283069842424203964441
OFFSET
1,1
COMMENTS
Diagonal of A183322
LINKS
EXAMPLE
Some solutions for 6X6
..0..0..0..0..0..0....0..0..0..0..0..0....1..1..0..0..0..0....0..0..0..0..0..0
..0..1..1..0..0..0....0..0..0..1..1..0....1..1..0..0..0..0....0..0..0..0..0..0
..0..1..1..1..1..1....1..1..0..1..1..0....0..0..0..0..0..1....0..0..0..1..1..0
..1..1..0..1..1..1....1..1..1..1..0..1....1..1..0..0..0..1....0..1..1..1..1..1
..1..1..1..1..1..1....1..1..1..1..1..1....1..1..0..0..0..1....1..1..1..1..1..1
..0..1..1..1..1..1....1..1..0..1..1..0....1..1..1..1..1..1....1..1..0..1..1..1
CROSSREFS
Sequence in context: A091241 A198076 A330675 * A066863 A296828 A135815
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2011
STATUS
approved