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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A183322

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

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

Adjacent sequences:  A183310 A183311 A183312 * A183314 A183315 A183316

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2011

STATUS

approved

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Last modified October 28 13:09 EDT 2020. Contains 338055 sequences. (Running on oeis4.)