A267250 - OEIS

%I #3 Jan 12 2016 09:11:01

%S 8,255,5804,129129,2499080,43555569,683027146,9748574556,127531124302,

%T 1540596418525,17291858116440,181338323456395,1785428392643952,

%U 16575758386318547

%N Number of 7Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.

%C Row 7 of A267245.

%e Some solutions for n=4

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

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

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

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

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

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

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

%Y Cf. A267245.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 12 2016