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, 1, 2, 61, 3686, 652374, 338047350, 527266113211, 2545622222227666

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 A347606 A094478

Adjacent sequences: A181002 A181003 A181004 * A181006 A181007 A181008

Keyword

nonn

Author

R. H. Hardin, Sep 30 2010

Status

approved