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A199827 Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero 1
24, 140, 646, 3556, 20240, 113884, 645780, 3685550, 21117750, 121503530, 701432670, 4060132070, 23557575574, 136975281374, 797920002262, 4655761528566, 27205829211568, 159187551327960, 932560727269722 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A199832

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=3

.-1...-2....3...-3....0....0...-3....2....1....0....1....2...-1....1....3....0

.-1...-3...-2...-2....2....1....1....3...-2....1....2...-1....2....3....0....1

..3....0....1....3...-1...-3....3....1....0...-2...-1....2....1....1...-1....0

.-2....3...-3....3....2....0...-1...-3...-1...-1...-3...-3....0...-3...-2....2

..1....2....1...-1...-3....2....0...-3....2....2....1....0...-2...-2....0...-3

CROSSREFS

Sequence in context: A205343 A267631 A305681 * A223471 A219988 A316928

Adjacent sequences:  A199824 A199825 A199826 * A199828 A199829 A199830

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2011

STATUS

approved

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Last modified April 17 05:12 EDT 2021. Contains 343059 sequences. (Running on oeis4.)