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Number of 5Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2
1

%I #4 Jan 06 2013 19:57:41

%S 0,256,418,1612900,78633756,22466712321,2294073688498,399487764096100,

%T 51031822108216122,7730096571419434884,1061888266253693915768,

%U 154122481474602369093121,21681358901642544133423968

%N Number of 5Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2

%C Row 5 of A221255

%H R. H. Hardin, <a href="/A221259/b221259.txt">Table of n, a(n) for n = 1..15</a>

%e Some solutions for n=3

%e ..1..2..0....0..2..1....0..2..0....0..2..1....1..2..0....0..2..1....0..2..2

%e ..0..2..2....0..2..1....1..2..0....1..2..1....1..2..1....0..2..0....0..2..1

%e ..0..2..1....1..2..0....1..2..2....0..2..0....0..2..0....1..2..1....0..2..0

%e ..0..2..0....0..2..0....0..2..0....0..2..1....0..2..1....1..2..1....0..2..2

%e ..1..2..0....2..2..0....0..2..1....0..2..1....1..2..0....0..2..0....0..2..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 06 2013