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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
85, 799, 2605, 7463, 14365, 33699, 53775, 90007, 136473, 213767, 289059, 433343, 552315, 763309, 989675, 1281575, 1548177, 2060815, 2445591, 3041291, 3622123, 4429993, 5095021, 6220341, 7131545, 8453999, 9715693, 11291939, 12624487 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A202006

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..38

EXAMPLE

Some solutions for n=2

.-2....2....2...-2....0....0....2....2...-1....0...-1....0...-2...-1...-2...-1

.-2....0...-1....2...-2....0....0....0....1....2....1....0....1....0....2....1

.-1...-2...-2...-1....2....0....0...-1....1....0....1...-2...-2....0....1....1

..2....0...-1....2....1....1...-2...-2....2....1....0....2....1....2....2....0

..2....0....2....2....2....0....0....1...-2...-2....0....2....2....0...-1...-1

.-1....0....0...-1...-1....0...-2....0...-1...-2...-1....0....2....1...-2....0

..2....0....0...-2...-2...-1....2....0....0....1....0...-2...-2...-2....0....0

CROSSREFS

Sequence in context: A020212 A183777 A173470 * A194533 A069308 A183643

Adjacent sequences:  A202006 A202007 A202008 * A202010 A202011 A202012

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 07 2011

STATUS

approved

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Last modified April 24 02:19 EDT 2014. Contains 240947 sequences.