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A213596 Number of n X n binary matrices with zero diagonal and x(i,j), x(j,k) and x(k,i) not all equal for i,j,k all different 0
1, 4, 36, 450, 5172, 75204, 1353240, 27948312 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A136224 A321963 A307903 * A009533 A135906 A197446

Adjacent sequences:  A213593 A213594 A213595 * A213597 A213598 A213599

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 15 2012

STATUS

approved

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Last modified September 18 12:35 EDT 2021. Contains 347527 sequences. (Running on oeis4.)