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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 Table of n, a(n) for n=1..7. 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 Adjacent sequences: A181231 A181232 A181233 * A181235 A181236 A181237 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.)