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A067210 Number of n X n 0..2 matrices with all row and column sums equal. 1
3, 9, 87, 5673, 2577513, 8459809773, 207495141083975, 39125696231091082665, 57899300601363050181107733, 683382115404724657577266518831159, 65156055488094891194179319045960728827635, 50704966066306827486637758645370695372532720829085 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Row 2 of A202784.

Sequence in context: A203559 A184098 A249789 * A018654 A003225 A203104

Adjacent sequences:  A067207 A067208 A067209 * A067211 A067212 A067213

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2002

EXTENSIONS

added one term and example - R. H. Hardin, Jan 05 2012

a(8)-a(12) from Andrew Howroyd, Jun 01 2017

STATUS

approved

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Last modified July 28 14:19 EDT 2021. Contains 346335 sequences. (Running on oeis4.)