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A181273
Number of n X n binary matrices M with rows in strictly increasing order and rows of M*Mtranspose (mod 2) in strictly decreasing order
0
2, 3, 9, 58, 1991, 177193, 50841045, 40797077296
OFFSET
1,1
COMMENTS
Diagonal of A181274
EXAMPLE
M and M*Mtranspose (mod 2) for 4X4
..0..0..1..0......1..1..0..0
..0..1..1..0......1..0..0..0
..1..0..0..0......0..0..1..1
..1..0..0..1......0..0..1..0
CROSSREFS
Sequence in context: A037389 A037425 A226967 * A270394 A120032 A126884
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 10 2010
STATUS
approved