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A238253 Number of (n+1)X(6+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.

%I A238253 #6 Jul 23 2025 10:49:21
%S A238253 1482,29995,1473792,65450601,3320993180,128727296869,5017308028639,
%T A238253 154350327958339,4704917436206270,118251124084419007,
%U A238253 2946366157111042290,62617673607295964138,1321308517824396221455,24384005345308756975149
%N A238253 Number of (n+1)X(6+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
%C A238253 Column 6 of A238255
%H A238253 R. H. Hardin, <a href="/A238253/b238253.txt">Table of n, a(n) for n = 1..31</a>
%e A238253 Some solutions for n=2
%e A238253 ..0..1..0..1..0..1..1....0..0..0..1..1..1..1....0..1..0..1..0..1..1
%e A238253 ..0..0..0..1..0..1..1....0..0..0..0..0..0..0....1..0..1..0..1..1..1
%e A238253 ..0..1..1..0..1..1..1....1..0..1..0..1..1..1....0..1..0..1..1..0..1
%K A238253 nonn
%O A238253 1,1
%A A238253 _R. H. Hardin_, Feb 21 2014