A207946 - OEIS

%I #5 Mar 31 2012 12:37:20

%S 12,144,612,3478,18172,98126,524104,2806686,15013734,80346942,

%T 429945512,2300766930,12311872834,65883534740,352556938048,

%U 1886609290440,10095657707146,54024066478278,289094554417718,1547007980129850

%N Number of nX5 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically

%C Column 5 of A207949

%H R. H. Hardin, <a href="/A207946/b207946.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 4*a(n-1) +4*a(n-2) +74*a(n-4) +78*a(n-5) +56*a(n-6) +272*a(n-7) +207*a(n-8) -126*a(n-9) -388*a(n-10) -296*a(n-11) +36*a(n-12) +152*a(n-13) +132*a(n-14) -16*a(n-16) -22*a(n-17) +a(n-20)

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 21 2012