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%I #6 Jun 26 2022 21:03:27
%S 81,1775,94325,14666689,5485899329,5517963998459,13522001820784289,
%T 86139022248212485459,1347161867209502898892029
%N Number of (n+1) X (n+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2 X 2 subblock equal.
%C Diagonal of A237809.
%e Some solutions for n=3
%e ..2..2..2..0....1..2..1..2....1..1..0..0....0..2..2..0....2..1..2..2
%e ..2..0..2..0....1..2..1..2....1..0..1..1....2..0..0..2....1..2..2..1
%e ..0..2..2..2....0..0..1..0....0..1..0..0....0..2..2..1....1..2..1..0
%e ..1..2..0..1....2..1..2..0....1..0..1..1....2..0..0..2....1..2..1..2
%Y Cf. A237809.
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 13 2014
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