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 A199904 Number of -3..3 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, 24, 72, 256, 1312, 5206, 21208, 97668, 422052, 1819620, 8158144, 36110122, 159422584, 712790438, 3182921756, 14206099012, 63688577860, 285783359204, 1282956672032, 5770687400200, 25983122754016, 117074268243396 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A199909 LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 EXAMPLE Some solutions for n=6 .-2....2...-1...-1....1...-2...-1...-2...-3...-3....2....2....2....3...-3...-1 ..3...-3....1....0...-3...-1....1....2....2...-1....0....1...-3...-1....2...-2 .-2....1....2...-2....1....0...-1....1....1....3....2...-1....1...-3...-3...-3 ..2....3....3....0....3....2....0...-3....0...-1...-3...-3...-3...-2....1....2 .-3...-2...-2....1...-2....1....1....2...-2....0...-1....1....1....2....2....3 ..2...-1...-3....2....0....0....0....0....2....2....0....0....2....1....1....1 CROSSREFS Sequence in context: A181617 A261256 A011915 * A250132 A025220 A112742 Adjacent sequences: A199901 A199902 A199903 * A199905 A199906 A199907 KEYWORD nonn AUTHOR R. H. Hardin Nov 11 2011 STATUS approved

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Last modified March 22 12:31 EDT 2023. Contains 361423 sequences. (Running on oeis4.)