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%I #4 Feb 08 2015 09:18:58
%S 2700,10484,40167,121701,426308,1351487,4771368,16058526,56235160,
%T 192884364,669557257,2305588750,7958763182,27396735121,94312947300,
%U 324414828833,1115586299491,3835775446691,13186270802164,45332896612376
%N Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum minus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally
%C Row 2 of A254804
%H R. H. Hardin, <a href="/A254805/b254805.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..0..1..1..1..1....0..0..0..0..0..0....0..0..1..1..1..1....0..1..0..0..1..1
%e ..0..0..0..1..0..0....1..1..1..0..0..0....0..0..1..1..1..1....0..1..0..0..0..0
%e ..1..0..0..1..0..1....0..0..0..0..1..1....1..1..1..1..0..0....1..1..0..0..1..1
%e ..1..0..1..1..1..1....1..1..1..0..0..0....0..0..1..1..0..1....1..0..1..0..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 08 2015
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