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A297982 Number of nX4 0..1 arrays with every element equal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero. 1

%I

%S 1,17,5,15,23,43,79,184,380,830,1776,3815,8227,17737,38335,82673,

%T 178600,385419,832806,1798455,3885410,8392102,18129621,39164405,

%U 84609476,182786176,394886142,853110431,1843063212,3981796702,8602359868

%N Number of nX4 0..1 arrays with every element equal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

%C Column 4 of A297986.

%H R. H. Hardin, <a href="/A297982/b297982.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 2*a(n-1) +2*a(n-2) -3*a(n-3) +2*a(n-4) -3*a(n-5) -9*a(n-6) -3*a(n-7) -3*a(n-8) +17*a(n-9) +13*a(n-10) +11*a(n-11) -5*a(n-12) -14*a(n-13) -a(n-14) +7*a(n-15) +10*a(n-16) -8*a(n-17) -12*a(n-18) -3*a(n-19) -5*a(n-20) +3*a(n-21) +2*a(n-22) for n>28

%e Some solutions for n=7

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

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

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

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

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

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

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

%Y Cf. A297986.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 10 2018

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Last modified September 17 06:16 EDT 2021. Contains 347478 sequences. (Running on oeis4.)