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 A221774 Number of nX2 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out left turns 1

%I #5 Jan 25 2013 07:48:53

%S 3,35,372,3943,41745,441877,4677106,49504700,523978608,5546002679,

%T 58701126836,621316327261,6576261708350,69605796705162,

%U 736735724582441,7797906979453335,82536181204107988,873596110577329432

%N Number of nX2 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out left turns

%C Column 2 of A221776

%H R. H. Hardin, <a href="/A221774/b221774.txt">Table of n, a(n) for n = 1..25</a>

%F Empirical: a(n) = 19*a(n-1) -117*a(n-2) +338*a(n-3) -469*a(n-4) +191*a(n-5) +237*a(n-6) -183*a(n-7) -64*a(n-8) +14*a(n-9)

%e Some solutions for n=3

%e ..1..1....0..2....0..3....2..0....0..1....1..0....2..0....0..0....2..1....2..2

%e ..2..2....4..0....1..1....0..0....3..0....2..1....0..1....5..1....0..2....2..0

%e ..0..0....0..0....1..0....3..1....2..0....2..0....0..3....0..0....0..1....0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 25 2013

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Last modified July 12 13:24 EDT 2024. Contains 374247 sequences. (Running on oeis4.)