A181008 Number of (n+4)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, 214, 175257, 262890863, 971594134303, 10088497788330117

Offset

1,5

Comments

Subdiagonal 4 of A181004

Links

Table of n, a(n) for n=1..9.

Example

All solutions for 8X4
..0..0..0..0
..0..0..1..1
..0..1..0..1
..0..1..1..0
..1..0..0..1
..1..0..1..0
..1..1..0..0
..1..1..1..1

Crossrefs

Sequence in context: A200901 A268547 A202319 * A191943 A046011 A038853

Adjacent sequences: A181005 A181006 A181007 * A181009 A181010 A181011

Keyword

nonn

Author

R. H. Hardin, Sep 30 2010

Status

approved