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%I #4 Mar 31 2012 12:35:50
%S 1,4,16,67,277,1025,3407,10265,28589,74945,187583,453167,1065257,
%T 2451317,5546819,12383627,27347117,59851121,130009223,280620167,
%U 602424305,1287187757,2739013259,5807246915,12272861813,25862365481
%N Half the number of nXnXn triangular binary arrays with each element having no more than two neighbors equal to itself
%e Some solutions for 5X5X5 with a(1,1)=0
%e ......0..........0..........0..........0..........0..........0..........0
%e .....1.1........0.1........1.1........1.1........1.1........1.0........1.1
%e ....1.0.1......1.1.0......1.0.0......1.0.1......0.0.1......1.0.1......0.0.0
%e ...0.1.0.1....1.0.0.1....0.1.1.1....1.0.1.0....1.1.0.0....0.0.1.0....0.1.1.0
%e ..1.0.1.1.0..1.0.1.1.0..1.0.0.0.1..0.1.1.0.0..1.0.1.1.0..1.1.1.0.0..1.0.1.0.1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 03 2011
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