%I #9 Aug 04 2018 10:35:06
%S 3,35,400,4525,51025,574800,6473175,72891475,820773600,9242002325,
%T 104065684825,1171786908400,13194399201775,148569807813675,
%U 1672905820612800,18837029565221725,212106191270112225
%N Number of n X 2 arrays of occupancy after each element stays put or moves to some kingmove neighbor.
%C Column 2 of A221225.
%H R. H. Hardin, <a href="/A221223/b221223.txt">Table of n, a(n) for n = 1..22</a>
%F Empirical: a(n) = 15*a(n1)  43*a(n2) + 10*a(n3).
%F Empirical g.f.: x*(3  10*x + 4*x^2) / (1  15*x + 43*x^2  10*x^3).  _Colin Barker_, Aug 04 2018
%e Some solutions for n=3:
%e ..0..0....2..0....2..1....2..0....1..3....0..0....3..1....0..0....2..1....2..0
%e ..4..0....2..1....0..0....2..0....0..0....1..2....1..1....5..1....0..1....0..2
%e ..0..2....1..0....1..2....1..1....0..2....3..0....0..0....0..0....2..0....2..0
%Y Cf. A221225.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 05 2013
