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%I #4 Jan 10 2013 19:38:22
%S 1,2,7,14,28,66,168,378,866,2128,5065,12000,28866,69652,167994,405058,
%T 981305,2381232,5776411,14040684,34175851,83246764,202960219,
%U 495273680,1209625253,2956269734,7229756488,17692733704,43322486571,106136686984
%N Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 4
%C Column 4 of A221321
%H R. H. Hardin, <a href="/A221317/b221317.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=7
%e ..0....2....1....3....0....0....0....1....0....0....2....0....3....1....0....1
%e ..3....0....3....2....2....1....1....0....1....1....1....5....0....0....2....2
%e ..0....1....0....0....0....2....0....2....0....0....0....0....1....2....0....1
%e ..1....3....2....1....1....1....2....1....1....3....1....1....0....0....2....0
%e ..0....0....0....0....0....0....1....0....0....0....0....0....1....1....1....1
%e ..1....1....1....1....1....1....0....1....5....3....2....1....0....3....2....0
%e ..2....0....0....0....3....2....3....2....0....0....1....0....2....0....0....2
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 10 2013
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