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A200424 Number of -2..2 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero 1
20, 80, 212, 594, 1928, 6780, 23674, 80750, 271000, 909282, 3082640, 10545846, 36174576, 123964062, 424595930, 1456168762, 5004245744, 17226485764, 59361633214, 204702938074, 706403203606, 2439664629760, 8432567247356 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A200430

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A337988 A002609 A195322 * A211463 A244449 A041776

Adjacent sequences:  A200421 A200422 A200423 * A200425 A200426 A200427

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 17 2011

STATUS

approved

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Last modified June 14 12:04 EDT 2021. Contains 345025 sequences. (Running on oeis4.)