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%I #4 May 13 2018 10:38:42
%S 8,49,117,322,1100,2957,8254,26698,77788,221123,681855,2041108,
%T 5932703,17889612,53854606,158987996,475744589,1430898909,4260906900,
%U 12733223515,38231707572,114317071912,341873189152,1025366065205,3071359996945
%N Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
%C Column 4 of A304472.
%H R. H. Hardin, <a href="/A304468/b304468.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 7*a(n-1) -17*a(n-2) +34*a(n-3) -113*a(n-4) +204*a(n-5) -132*a(n-6) +220*a(n-7) -539*a(n-8) +180*a(n-9) +308*a(n-10) +84*a(n-11) -56*a(n-12) -532*a(n-13) +370*a(n-14) -87*a(n-15) +214*a(n-16) -176*a(n-17) +38*a(n-18) -20*a(n-19) +18*a(n-20) -4*a(n-21) for n>25
%e Some solutions for n=5
%e ..0..0..0..0. .0..0..1..0. .0..0..1..1. .0..1..1..1. .0..0..1..0
%e ..1..1..1..1. .1..0..1..1. .0..0..0..1. .1..0..1..1. .0..0..1..1
%e ..1..1..1..1. .1..1..1..1. .0..1..1..1. .1..0..1..1. .0..0..0..0
%e ..0..1..1..1. .0..0..1..1. .0..0..1..1. .1..0..1..1. .0..0..0..0
%e ..0..0..1..1. .1..0..1..0. .1..1..1..0. .0..1..1..0. .1..1..1..1
%Y Cf. A304472.
%K nonn
%O 1,1
%A _R. H. Hardin_, May 13 2018