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 A202009 Number of -n..n circular arrays x(0..6) of 7 elements with zero sums of x(i) and x(i)*x((i+1) mod 7) 1

%I #5 Mar 31 2012 12:36:46

%S 85,799,2605,7463,14365,33699,53775,90007,136473,213767,289059,433343,

%T 552315,763309,989675,1281575,1548177,2060815,2445591,3041291,3622123,

%U 4429993,5095021,6220341,7131545,8453999,9715693,11291939,12624487

%N Number of -n..n circular arrays x(0..6) of 7 elements with zero sums of x(i) and x(i)*x((i+1) mod 7)

%C Row 5 of A202006

%H R. H. Hardin, <a href="/A202009/b202009.txt">Table of n, a(n) for n = 1..38</a>

%e Some solutions for n=2

%e .-2....2....2...-2....0....0....2....2...-1....0...-1....0...-2...-1...-2...-1

%e .-2....0...-1....2...-2....0....0....0....1....2....1....0....1....0....2....1

%e .-1...-2...-2...-1....2....0....0...-1....1....0....1...-2...-2....0....1....1

%e ..2....0...-1....2....1....1...-2...-2....2....1....0....2....1....2....2....0

%e ..2....0....2....2....2....0....0....1...-2...-2....0....2....2....0...-1...-1

%e .-1....0....0...-1...-1....0...-2....0...-1...-2...-1....0....2....1...-2....0

%e ..2....0....0...-2...-2...-1....2....0....0....1....0...-2...-2...-2....0....0

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 07 2011

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Last modified May 28 16:48 EDT 2024. Contains 372916 sequences. (Running on oeis4.)