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A203558 Number of nX2 0..2 arrays with row sums equal and column sums equal 1
3, 9, 9, 33, 53, 183, 395, 1249, 3141, 9459, 25655, 75639, 212943, 623093, 1787609, 5222369, 15134933, 44250051, 128996855, 377748883, 1105350731, 3242546393, 9513228125, 27953744695, 82176836303, 241834027353, 712070156205 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A203564

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A228977 A223576 A125824 * A223653 A238912 A038227

Adjacent sequences:  A203555 A203556 A203557 * A203559 A203560 A203561

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2012

STATUS

approved

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Last modified August 1 22:01 EDT 2021. Contains 346408 sequences. (Running on oeis4.)