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A229415 Number of n X n 0..2 zero-diagonal arrays with corresponding row and column sums equal 0
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 September 24 21:05 EDT 2021. Contains 347651 sequences. (Running on oeis4.)