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%I #5 Nov 28 2014 09:35:04
%S 262144,128000000,250000000000,1953125000000000,5744580078125000000,
%T 43254022503125000000000,833747762130149888000000000,
%U 6537811332601933992442920960000,104624647058119410496536003666247680
%N Number of (n+2)X(n+2) 0..3 arrays with nondecreasing sum of every three consecutive values in every row and column
%C Diagonal of A250868
%H R. H. Hardin, <a href="/A250860/b250860.txt">Table of n, a(n) for n = 1..12</a>
%e Some solutions for n=1
%e ..0..2..3....2..0..3....0..2..1....0..3..0....0..0..1....2..0..2....0..1..1
%e ..3..3..3....0..3..2....2..2..3....3..0..2....2..3..3....2..1..2....3..2..2
%e ..2..1..0....3..3..1....2..2..1....1..3..1....3..3..2....2..3..2....3..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 28 2014
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