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A202555 Number of nX3 0,1 arrays with the row and column sums nondecreasing.

%I A202555 #7 Jul 22 2025 16:38:54
%S A202555 4,17,66,235,824,2848,9520,31648,104536,339553,1099666,3549038,
%T A202555 11338836,36160324,115069316,363700188,1148126044,3619072821,
%U A202555 11352513438,35579368776,111388887136,347450537496,1083054672896,3373317547471
%N A202555 Number of nX3 0,1 arrays with the row and column sums nondecreasing.
%C A202555 Column 3 of A202560
%H A202555 R. H. Hardin, <a href="/A202555/b202555.txt">Table of n, a(n) for n = 1..117</a>
%e A202555 Some solutions for n=8
%e A202555 ..0..1..0....0..1..0....1..0..0....0..0..0....0..0..0....0..1..1....1..0..0
%e A202555 ..0..0..1....0..1..0....0..0..1....0..0..1....0..0..1....1..0..1....1..1..0
%e A202555 ..0..0..1....0..0..1....0..0..1....0..0..1....0..0..1....1..1..0....1..0..1
%e A202555 ..0..1..0....0..0..1....0..0..1....1..0..0....0..1..0....1..0..1....1..1..0
%e A202555 ..0..1..0....1..0..1....0..1..1....0..1..0....0..1..0....0..1..1....0..1..1
%e A202555 ..0..0..1....1..0..1....1..1..0....0..1..1....1..0..0....0..1..1....0..1..1
%e A202555 ..1..0..0....0..1..1....1..0..1....0..1..1....0..0..1....0..1..1....1..0..1
%e A202555 ..0..1..1....1..1..0....0..1..1....1..1..1....0..1..1....1..0..1....0..1..1
%K A202555 nonn
%O A202555 1,1
%A A202555 _R. H. Hardin_ Dec 21 2011