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 A229415 Number of n X n 0..2 zero-diagonal arrays with corresponding row and column sums equal 1
 1, 3, 45, 4743, 3801411, 23938685973, 1215663478473627 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A229417 LINKS Table of n, a(n) for n=1..7. EXAMPLE Some solutions for n=4 ..0..1..2..1....0..1..2..0....0..0..2..0....0..1..1..2....0..2..0..1 ..2..0..2..0....2..0..0..0....2..0..1..0....0..0..2..0....2..0..0..1 ..0..2..0..2....0..1..0..1....0..2..0..1....2..1..0..2....0..1..0..0 ..2..1..0..0....1..0..0..0....0..1..0..0....2..0..2..0....1..0..1..0 CROSSREFS Sequence in context: A268196 A057863 A302156 * A265621 A124488 A086683 Adjacent sequences: A229412 A229413 A229414 * A229416 A229417 A229418 KEYWORD nonn AUTHOR R. H. Hardin Sep 22 2013 STATUS approved

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Last modified June 9 23:59 EDT 2023. Contains 363183 sequences. (Running on oeis4.)