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Number of 6Xn 0..1 arrays with row sums nondecreasing and column sums unimodal
0

%I #3 Mar 24 2013 10:31:36

%S 7,247,7504,228401,6555965,180713080,4777458798,122344224851,

%T 3041708958520,73824736436005,1754118644947248,40935403480469124,

%U 940380376523871886

%N Number of 6Xn 0..1 arrays with row sums nondecreasing and column sums unimodal

%C Row 6 of A223625

%e Some solutions for n=3

%e ..0..1..0....0..0..1....1..0..0....0..0..0....0..0..0....0..1..0....0..0..1

%e ..0..0..1....0..0..1....1..0..0....0..1..0....1..0..0....0..1..0....0..0..1

%e ..0..0..1....0..0..1....0..1..1....0..1..0....0..0..1....0..0..1....0..1..0

%e ..0..1..0....0..0..1....0..1..1....0..1..1....0..1..0....0..0..1....0..1..0

%e ..0..1..0....1..0..0....0..1..1....1..0..1....1..0..0....0..1..0....0..1..1

%e ..0..1..0....0..1..0....1..1..1....1..1..1....1..1..0....0..0..1....1..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 24 2013