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%I A266422 #6 Apr 20 2020 19:43:11
%S A266422 2,7,39,404,8764,448649,59155748,21325003746,21901867532457,
%T A266422 66087854484252677,600640567173169508177
%N A266422 Number of n X n binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.
%C A266422 Diagonal of A266428.
%e A266422 Some solutions for n=4
%e A266422 ..0..0..0..1....0..0..0..0....0..0..1..1....0..0..0..0....0..0..1..1
%e A266422 ..0..1..1..1....0..1..1..1....0..1..0..0....0..0..1..1....0..1..0..1
%e A266422 ..1..0..1..1....1..0..0..1....1..0..1..1....0..1..0..0....0..1..1..1
%e A266422 ..1..1..1..1....1..1..1..0....1..1..0..1....1..0..1..1....1..0..0..1
%Y A266422 Cf. A266428.
%K A266422 nonn
%O A266422 1,1
%A A266422 _R. H. Hardin_, Dec 29 2015

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