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A207952 Number of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically 1

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

%S 26,676,4238,26569,98126,362404,1007146,2798929,6501278,15100996,

%T 30983078,63568729,119052836,222964624,389322036,679801329,1122859818,

%U 1854680356,2928100406,4622776081,7029589490,10689492100,15748468190

%N Number of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically

%C Row 6 of A207949

%H R. H. Hardin, <a href="/A207952/b207952.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 2*a(n-1) +10*a(n-2) -22*a(n-3) -44*a(n-4) +110*a(n-5) +110*a(n-6) -330*a(n-7) -165*a(n-8) +660*a(n-9) +132*a(n-10) -924*a(n-11) +924*a(n-13) -132*a(n-14) -660*a(n-15) +165*a(n-16) +330*a(n-17) -110*a(n-18) -110*a(n-19) +44*a(n-20) +22*a(n-21) -10*a(n-22) -2*a(n-23) +a(n-24)

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 21 2012

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Last modified April 19 14:04 EDT 2024. Contains 371792 sequences. (Running on oeis4.)