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A223626
Number of 2Xn 0..1 arrays with row sums nondecreasing and column sums unimodal
1
3, 11, 35, 98, 260, 643, 1563, 3631, 8407, 18833, 42313, 92621, 203973, 439525, 954373, 2033480, 4369630, 9232317, 19680561, 41311764, 87507822, 182738699, 385095795, 800788788, 1680371358, 3482028637, 7280492521, 15041978366
OFFSET
1,1
COMMENTS
Row 2 of A223625
LINKS
EXAMPLE
Some solutions for n=3
..0..0..0....0..1..0....0..1..1....0..1..0....0..0..1....0..0..0....0..0..1
..0..0..0....1..1..0....0..1..1....0..0..1....1..1..0....0..1..0....0..1..1
CROSSREFS
Sequence in context: A361435 A094308 A166046 * A088578 A320683 A027060
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 24 2013
STATUS
approved