Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%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