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A229867 Number of n X n 0..3 arrays with corresponding row and column sums equal 0
4, 64, 8704, 15106048, 354003288064, 115737559589453824, 542277543422445827915776 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A229870

LINKS

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

EXAMPLE

Some solutions for n=4

..0..0..2..2....0..2..0..2....0..0..2..2....0..2..0..0....0..2..2..0

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

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

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

CROSSREFS

Sequence in context: A053923 A326868 A211214 * A051191 A120581 A146520

Adjacent sequences:  A229864 A229865 A229866 * A229868 A229869 A229870

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 01 2013

STATUS

approved

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Last modified September 25 13:37 EDT 2021. Contains 347654 sequences. (Running on oeis4.)