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A181234 Number of (2*n)Xn binary matrices with all row sums equal and all column sums equal 0
2, 8, 182, 49772, 113400002, 4027811102702, 1237505791330809002 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A181236
LINKS
EXAMPLE
Some solutions for 6X3
..1..0..0....0..1..1....1..0..0....1..1..0....0..1..0....1..0..0....0..0..1
..0..1..0....1..0..1....0..1..0....1..1..0....1..0..0....0..0..1....1..0..0
..1..0..0....1..1..0....0..0..1....0..1..1....0..0..1....0..1..0....0..1..0
..0..0..1....1..1..0....0..0..1....0..1..1....0..1..0....0..1..0....1..0..0
..0..0..1....0..1..1....1..0..0....1..0..1....0..0..1....0..0..1....0..1..0
..0..1..0....1..0..1....0..1..0....1..0..1....1..0..0....1..0..0....0..0..1
CROSSREFS
Sequence in context: A213200 A317794 A009377 * A156526 A009505 A305737
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 10 2010
STATUS
approved

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Last modified April 23 07:08 EDT 2024. Contains 371906 sequences. (Running on oeis4.)