A221450 - OEIS

%I #4 Jan 17 2013 05:09:55

%S 1,355,9829,230845,6415089,177320895,4832005625,131942833529,

%T 3606055280657,98529266203659,2692051448713949,73554857285973785,

%U 2009736562063323785,54911874439751493035,1500353181134236949205

%N Hilltop maps: number of 5Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 5Xn array

%C Row 5 of A221446

%H R. H. Hardin, <a href="/A221450/b221450.txt">Table of n, a(n) for n = 1..49</a>

%e Some solutions for n=3

%e ..0..1..1....0..1..0....1..1..0....1..0..1....1..1..0....0..1..0....1..1..1

%e ..1..1..0....0..0..0....0..1..0....0..1..0....1..1..0....0..1..1....1..0..0

%e ..1..1..0....1..1..1....0..1..0....0..0..1....1..1..1....0..0..0....1..1..1

%e ..1..1..1....0..1..0....1..1..1....1..1..1....0..0..1....1..1..0....1..1..1

%e ..1..0..1....0..0..1....1..0..1....0..0..1....1..1..0....1..0..1....1..1..1

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 17 2013