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%I #6 Apr 20 2020 19:43:35
%S 2,4,12,66,735,18808,1231170,223521350,119000455681,193166954325425,
%T 983670413713595700
%N Number of n X n binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.
%C Diagonal of A266470.
%e Some solutions for n=4
%e ..0..0..0..0....0..0..1..1....0..0..0..1....0..0..0..0....0..1..1..1
%e ..0..0..1..1....1..1..0..1....0..1..1..0....0..0..0..1....1..0..0..1
%e ..1..1..0..0....1..1..1..0....1..0..0..0....0..0..1..0....1..0..1..0
%e ..1..1..1..1....1..1..1..0....1..1..1..1....1..1..0..0....1..1..0..0
%Y Cf. A266470.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 29 2015
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