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A298254 Number of nX3 0..1 arrays with every element equal to 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.

%I A298254 #4 Jan 15 2018 14:56:40
%S A298254 0,3,1,4,3,7,14,35,89,242,643,1713,4584,12341,33393,90828,247775,
%T A298254 677335,1853786,5076655,13907485,38106762,104424087,286173877,
%U A298254 784293860,2149515757,5891305033,16146865524,44255648343,121297428367,332457355358
%N A298254 Number of nX3 0..1 arrays with every element equal to 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.
%C A298254 Column 3 of A298259.
%H A298254 R. H. Hardin, <a href="/A298254/b298254.txt">Table of n, a(n) for n = 1..210</a>
%F A298254 Empirical: a(n) = 3*a(n-1) +3*a(n-2) -7*a(n-3) -14*a(n-4) +2*a(n-5) +34*a(n-6) +16*a(n-7) -20*a(n-8) -48*a(n-9) -50*a(n-10) +36*a(n-11) +89*a(n-12) +39*a(n-13) +3*a(n-14) -9*a(n-15) -14*a(n-16) +2*a(n-18) for n>19
%e A298254 Some solutions for n=7
%e A298254 ..0..0..0. .0..1..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..1
%e A298254 ..1..0..1. .0..0..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..1..1
%e A298254 ..1..1..1. .1..0..1. .0..0..0. .0..0..0. .1..1..1. .1..1..1. .0..1..0
%e A298254 ..1..0..0. .1..1..0. .1..1..1. .0..0..0. .1..1..1. .1..1..1. .1..0..0
%e A298254 ..0..1..0. .1..0..1. .1..1..1. .1..1..1. .1..1..1. .1..1..1. .1..1..1
%e A298254 ..0..1..1. .0..0..1. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .1..0..1
%e A298254 ..0..0..1. .0..1..1. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..0..0
%Y A298254 Cf. A298259.
%K A298254 nonn
%O A298254 1,2
%A A298254 _R. H. Hardin_, Jan 15 2018