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%I #3 Nov 03 2012 19:01:50
%S 1,4001,261505,16773633,1073490145,68702054721,4396923919617,
%T 281403077821441,18009795930773137,1152626873213807201,
%U 73768115566393606785,4721159119167361543169,302154165890141908970689
%N Hilltop maps: number of 6Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 6Xn array
%C Row 6 of A218638
%e Some solutions for n=3
%e ..0..1..0....0..0..1....0..1..0....0..1..0....0..0..0....0..0..1....0..0..1
%e ..1..0..0....0..0..1....0..1..0....0..1..0....1..1..0....1..1..0....1..1..0
%e ..1..0..0....0..1..0....1..0..0....1..0..0....1..0..0....0..0..0....1..0..1
%e ..0..0..1....1..1..1....1..1..0....1..1..1....0..0..0....1..0..1....1..1..0
%e ..0..0..0....1..0..1....0..0..0....0..0..1....0..0..0....0..1..0....0..1..1
%e ..0..0..1....1..1..0....1..1..1....0..1..0....1..1..1....1..0..0....1..1..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 03 2012