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A218423 Hilltop maps: number of nX5 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 nX5 array.

%I A218423 #6 Jul 22 2025 23:56:51
%S A218423 17,737,20793,629659,19003811,572765605,17270172871,520703946625,
%T A218423 15699497444771,473348740584743,14271727157207365,430300515162577777,
%U A218423 12973799949967137925,391167286570698841921,11793911323529489973393
%N A218423 Hilltop maps: number of nX5 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 nX5 array.
%C A218423 Column 5 of A218426
%H A218423 R. H. Hardin, <a href="/A218423/b218423.txt">Table of n, a(n) for n = 1..64</a>
%e A218423 Some solutions for n=3
%e A218423 ..0..0..0..0..1....0..1..0..1..1....1..0..1..0..0....1..1..0..1..0
%e A218423 ..1..1..0..0..0....0..0..1..1..1....0..0..0..1..1....0..1..0..0..1
%e A218423 ..1..1..1..0..1....0..1..1..0..1....1..0..0..1..1....0..1..1..0..0
%K A218423 nonn
%O A218423 1,1
%A A218423 _R. H. Hardin_ Oct 28 2012