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%I #3 Mar 31 2012 12:35:46
%S 2,34,390,4475,52186,606546,7053923,82032712,953982820,11094190209,
%T 129018028226,1500393683522,17448578663219,202915341402216,
%U 2359770191311572,27442554696574793,319138622503858354
%N Half the number of nX4 binary arrays with each element equal to at least one neighbor
%C Column 4 of A180771
%H R. H. Hardin, <a href="/A180764/b180764.txt">Table of n, a(n) for n=1..99</a>
%F Empirical: a(n) = 9*a(n-1) + 35*a(n-2) - 29*a(n-3) - 256*a(n-4) - 120*a(n-5) + 695*a(n-6) + 579*a(n-7) - 949*a(n-8) - 1076*a(n-9) + 485*a(n-10) + 1488*a(n-11) + 588*a(n-12) - 857*a(n-13) - 368*a(n-14) - 73*a(n-15) - 52*a(n-16) + 26*a(n-17) + 14*a(n-18) + 12*a(n-19) - 4*a(n-20)
%K nonn
%O 1,1
%A _R. H. Hardin_ Sep 20 2010
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