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A229416 Number of n X n 0..3 zero-diagonal arrays with corresponding row and column sums equal 0
1, 4, 136, 59008, 345706336, 28256240134144, 33097994593655140864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A229417

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

..0..2..3..3....0..0..0..1....0..1..2..0....0..3..2..0....0..3..0..1

..3..0..3..0....0..0..0..1....0..0..3..3....2..0..2..3....1..0..2..2

..2..3..0..3....0..0..0..3....3..2..0..3....0..2..0..3....3..0..0..1

..3..1..2..0....1..1..3..0....0..3..3..0....3..2..1..0....0..2..2..0

CROSSREFS

Sequence in context: A054052 A012070 A001374 * A155207 A201388 A089666

Adjacent sequences:  A229413 A229414 A229415 * A229417 A229418 A229419

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 22 2013

STATUS

approved

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Last modified October 17 13:10 EDT 2021. Contains 348048 sequences. (Running on oeis4.)