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Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor
1

%I #4 Jan 03 2013 09:39:53

%S 8,352,14704,609961,25266305,1046229704,43318295565,1793512771275,

%T 74256503785519,3074423327838949,127289505511741394,

%U 5270131676800319948,218197773791764622997,9033980715508142596386,374031347287341441297064

%N Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor

%C Column 3 of A221165

%H R. H. Hardin, <a href="/A221163/b221163.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 03 2013