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A200425 Number of -3..3 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero 1
92, 520, 2232, 9898, 50592, 270848, 1432402, 7469120, 38883992, 203526914, 1071337158, 5658347658, 29934599276, 158560687098, 841075030030, 4468272429398, 23771639720040, 126620792508358, 675163140324368 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A200430

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A233311 A233309 A205992 * A107343 A231300 A176630

Adjacent sequences:  A200422 A200423 A200424 * A200426 A200427 A200428

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 17 2011

STATUS

approved

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Last modified May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)