A202011 Number of -n..n circular arrays x(0..8) of 9 elements with zero sums of x(i) and x(i)*x((i+1) mod 9)

577, 15751, 101395, 490879, 1519417, 4460689, 9882793, 21851983, 40831435, 77490037, 129389941, 219474487, 336880639, 536126239, 777338533, 1152674479, 1605065239, 2301180355, 3090983005, 4236736987, 5528432323, 7416995779

Offset

1,1

Comments

Row 7 of A202006

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for n=1
..1....1....0....0....0....0...-1....0...-1...-1....0....0....1....1....1....0
..0....0...-1...-1....0....1...-1...-1...-1....1....1....1....0....0....1....1
.-1....1....0....0...-1....0....0....1....1....0....1....0...-1....0...-1....0
..0...-1...-1....1....1....0....1....1....1....0...-1....0....1...-1....0....0
.-1....0....0....1...-1....0...-1....0....0...-1...-1....0...-1....1....0...-1
..0....0....1...-1...-1....0....1....0....0...-1....0....0...-1....1...-1....0
..1...-1....0....0....0....1....1....0....1....1...-1....0....0...-1...-1....0
..0...-1....0....0....1...-1....0....0...-1....1....1...-1....0...-1....1....0
..0....1....1....0....1...-1....0...-1....0....0....0....0....1....0....0....0

Crossrefs

Sequence in context: A154514 A278740 A101249 * A157264 A201046 A154511

Adjacent sequences: A202008 A202009 A202010 * A202012 A202013 A202014

Keyword

nonn

Author

R. H. Hardin Dec 07 2011

Status

approved