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A199903 Number of -2..2 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2) 1
1, 4, 12, 24, 82, 232, 654, 2044, 6096, 18564, 57500, 177032, 550098, 1715956, 5359158, 16799508, 52760640, 165976252, 523094304, 1650781728, 5216112586, 16501009804, 52252555938, 165618780196, 525388548976, 1667965025692 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A199909

LINKS

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

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A282512 A025543 A064354 * A218034 A140813 A073841

Adjacent sequences: A199900 A199901 A199902 * A199904 A199905 A199906

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2011

STATUS

approved

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Last modified January 29 00:02 EST 2023. Contains 359905 sequences. (Running on oeis4.)