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%I #4 Nov 03 2012 13:45:20
%S 1,11011,1782855,227451273,28782653703,3663996495065,467122877883141,
%T 59564772010560679,7594747878648617511,968342656073731373915,
%U 123465264778955860526245,15742032324396343036237669
%N Hilltop maps: number of 7Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..2 7Xn array
%C Row 7 of A218592
%H R. H. Hardin, <a href="/A218598/b218598.txt">Table of n, a(n) for n = 1..21</a>
%e Some solutions for n=3
%e ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
%e ..1..0..0....1..0..0....1..0..0....1..0..0....1..1..1....1..0..0....1..1..0
%e ..1..1..0....0..0..1....1..1..0....1..0..0....0..0..0....1..1..0....0..1..1
%e ..0..0..0....0..1..1....1..0..1....1..1..1....0..1..0....0..0..1....1..1..0
%e ..1..0..1....0..1..0....1..1..1....0..1..0....1..0..0....1..1..0....0..0..0
%e ..1..1..0....1..1..1....1..0..1....1..0..0....0..0..0....1..1..0....1..0..0
%e ..1..1..0....1..1..0....0..0..1....0..0..1....0..1..1....0..0..1....1..1..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 03 2012
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