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 A221134 Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2 1

%I #4 Jan 02 2013 19:44:49

%S 2,49,656,12544,200072,3485689,58132316,990486784,16699002692,

%T 282999528529,4783766470826,80965479678724,1369496232351362,

%U 23171487659654569,391996208325992186,6631958618350959364

%N Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2

%C Column 3 of A221139

%H R. H. Hardin, <a href="/A221134/b221134.txt">Table of n, a(n) for n = 1..29</a>

%F Empirical: a(n) = 21*a(n-1) -1450*a(n-3) +4782*a(n-4) -372*a(n-5) +1450*a(n-6) +69*a(n-8) +a(n-9)

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 02 2013

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Last modified March 2 00:03 EST 2024. Contains 370447 sequences. (Running on oeis4.)