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A181005 Number of (n+1)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, 1, 2, 61, 3686, 652374, 338047350, 527266113211, 2545622222227666 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Subdiagonal 1 of A181004

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

All solutions for 5X4

..0..0..0..0....0..0..0..0

..0..0..1..1....0..0..1..1

..0..1..0..1....0..1..0..1

..1..0..1..0....1..0..0..1

..1..1..0..0....1..1..1..1

CROSSREFS

Sequence in context: A037065 A065589 A190681 * A289644 A094478 A273090

Adjacent sequences:  A181002 A181003 A181004 * A181006 A181007 A181008

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 30 2010

STATUS

approved

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Last modified December 3 23:53 EST 2020. Contains 338920 sequences. (Running on oeis4.)