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A203559 Number of nX3 0..2 arrays with row sums equal and column sums equal 1
3, 9, 87, 177, 993, 10833, 35619, 219873, 2083713, 8710539, 55644339, 473819481, 2320792659, 15120204297, 119105713827, 650725327233, 4293779332929, 32065818855387, 188739799967427, 1256510215733187, 9061494550445907 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A203564

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..122

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A032078 A307799 A326159 * A184098 A249789 A067210

Adjacent sequences:  A203556 A203557 A203558 * A203560 A203561 A203562

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2012

STATUS

approved

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Last modified July 5 04:19 EDT 2020. Contains 335459 sequences. (Running on oeis4.)