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%I #5 Feb 03 2014 05:24:52
%S 256,51000,53940782,540145357880,39085052507056252,
%T 22189788076602239718380,91400599993738526926922639384,
%U 2729637406626551747794693403062699368
%N Number of (n+1)X(n+1) 0..3 arrays with the upper median of every 2X2 subblock equal
%C Diagonal of A237076
%H R. H. Hardin, <a href="/A237068/b237068.txt">Table of n, a(n) for n = 1..9</a>
%e Some solutions for n=2
%e ..0..3..1....0..0..1....2..2..3....2..1..2....1..3..2....3..1..2....0..3..2
%e ..3..3..2....3..2..2....3..3..0....1..1..1....0..2..1....1..2..1....0..3..3
%e ..3..2..3....1..2..0....2..3..2....3..1..1....3..2..2....2..3..2....3..0..3
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 03 2014