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A181006
Number of (n+2)xn binary matrices with rows and columns each in strictly increasing order as binary numbers and each row and column having an even number of 1s
0
0, 0, 0, 0, 123, 16675, 5752742, 5565513638, 15996779979401, 141854932507575253
OFFSET
1,5
COMMENTS
Subdiagonal 2 of A181004
EXAMPLE
Some solutions for 7X5
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..1..1....0..0..0..1..1....0..0..0..1..1....0..0..0..1..1
..0..0..1..0..1....0..0..1..0..1....0..0..1..0..1....0..0..1..0..1
..0..0..1..1..0....0..0..1..1..0....0..0..1..1..0....0..0..1..1..0
..0..1..0..1..0....0..1..0..1..0....0..1..1..0..0....0..1..1..0..0
..1..0..0..1..0....1..0..1..0..0....1..0..0..1..0....1..0..1..0..0
..1..1..0..0..0....1..1..1..1..0....1..1..1..1..0....1..1..0..0..0
CROSSREFS
Sequence in context: A095761 A121917 A049670 * A362497 A289331 A334181
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 30 2010
STATUS
approved