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%I #4 Feb 03 2017 08:19:43
%S 2,8,30,112,420,1576,5912,22176,83184,312032,1170464,4390528,16469312,
%T 61778048,231735680,869263872,3260696320,12231200256,45880463872,
%U 172102240256,645572834304,2421608712192,9083698141184,34073866477568
%N Number of nX2 0..1 arrays with no element unequal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards.
%C Column 2 of A281955.
%H R. H. Hardin, <a href="/A281949/b281949.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 4*a(n-1) -2*a(n-2) +4*a(n-3)
%e Some solutions for n=4
%e ..0..1. .0..0. .0..1. .0..0. .0..0. .0..1. .0..1. .0..0. .0..1. .0..0
%e ..0..1. .0..0. .1..1. .1..0. .1..0. .0..1. .1..1. .0..1. .0..0. .0..1
%e ..0..1. .0..0. .0..1. .1..1. .1..1. .1..1. .0..1. .0..1. .0..0. .1..0
%e ..1..1. .1..1. .1..0. .1..1. .0..0. .0..0. .0..1. .0..0. .1..0. .0..1
%Y Cf. A281955.
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 03 2017
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