The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 22 05:50 EDT 2023. Contains 365519 sequences. (Running on oeis4.)