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%I
%S 1,15,511,65535,33552513,68715299265,562915602593793
%N Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 n X n array
%C Diagonal of A218242
%e Some solutions for n=3
%e ..1..1..0....0..1..0....1..0..1....1..0..1....0..1..0....1..1..0....0..1..0
%e ..0..1..0....0..1..0....0..0..1....0..0..1....1..0..1....0..1..1....0..0..0
%e ..0..1..1....1..1..0....1..1..1....1..1..0....1..0..1....0..1..1....1..0..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Oct 24 2012
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