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A213795 Number of n X n 0..3 symmetric arrays with every row summing to floor(n*3/2) 0
1, 4, 29, 880, 87932, 34725760, 46259653191, 250599609089536 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A213800

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A272869 A166168 A126559 * A159862 A298648 A164820

Adjacent sequences:  A213792 A213793 A213794 * A213796 A213797 A213798

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 20 2012

STATUS

approved

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Last modified July 22 20:51 EDT 2019. Contains 325226 sequences. (Running on oeis4.)