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%I #7 Dec 31 2023 17:38:34
%S 81,2192,27362,403698,7257328,196170260,4643086490,176392793534,
%T 7735283529732,473507980691236,33662526487544248,4000330502181468930,
%U 385260385567127025928,74373894362155945768362
%N Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal maximum plus antidiagonal minimum unequal to its neighbors horizontally, vertically and ne+sw antidiagonally.
%C Diagonal of A253407.
%H R. H. Hardin, <a href="/A253399/b253399.txt">Table of n, a(n) for n = 1..15</a>
%e Some solutions for n=3
%e ..1..0..2..2....2..1..1..1....1..0..1..2....0..1..0..0....2..0..1..2
%e ..1..0..0..0....1..0..2..2....0..1..2..2....2..1..1..0....1..0..0..1
%e ..2..2..1..0....2..0..0..2....0..0..0..2....1..2..1..1....0..1..2..2
%e ..2..1..0..1....0..2..1..2....1..2..0..1....0..1..1..0....0..0..0..2
%Y Cf. A253407.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 31 2014
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