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A267988 Number of nX2 arrays containing 2 copies of 0..n-1 with row sums and column sums nondecreasing. 0
1, 4, 21, 189, 1941, 28032, 448157, 8951313, 194183520, 4923018003, 134463192215 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A267990.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=6

..0..1....0..4....3..0....0..3....0..0....1..1....0..1....1..3....1..3....0..3

..2..2....4..1....3..1....0..5....4..1....0..4....3..0....0..4....0..5....3..2

..5..0....0..5....4..0....1..4....1..5....0..5....2..3....0..5....3..2....5..0

..1..5....2..3....2..4....2..3....4..2....2..4....1..4....3..2....4..1....1..4

..3..4....2..3....1..5....1..5....3..3....3..3....4..2....1..5....5..0....1..4

..4..3....1..5....2..5....4..2....2..5....2..5....5..5....4..2....2..4....5..2

CROSSREFS

Cf. A267990.

Sequence in context: A158108 A158258 A065527 * A041667 A286883 A217144

Adjacent sequences:  A267985 A267986 A267987 * A267989 A267990 A267991

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 23 2016

STATUS

approved

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Last modified October 21 14:20 EDT 2019. Contains 328301 sequences. (Running on oeis4.)